Through USSF -
Yes, you may buy up to 4 tickets per household, 1 for yourself and 3 guests.

Through USSF -
At this time, Visa/Master Card/American Express are all accepted through Ussocccer.com;

Now you're asking yourself "What about purchasing tickets through FIFA?" Well if you look at how FIFA has structured the ticket sales, it's somewhat complex. (although it doesn't take a rocket scientist to figure it out).  It comes down to this, of the two phases that are of the lottery type (Sales phase 1 and 3) you'll probably have a 30% chance of getting tickets. This is based on a few assumptions. See FAQ 1.02 above.
1) Currently there are 812,000 tickets up for sale and as of 25-FEB, 2.1MM ticket requests. For arguments sake, we'll assume that ticket sales are on a reverse bell curve and we'll see sales pick up at the end of March thus getting to a 4MM request. Then your chance is 20%.
2) We can adjust upward the chance of obtaining tickets because many people are applying for the knock-out phase games and as such due to the physical capacity limitations either their application will be rejected outright or their ticket package will need to be reduced
 

During the "First-Come First-Serve" sales phase (phases 2,4 and 5), you're just going to need to be available the day the sales phase open to apply for tickets.

Some other noteworthy items to think about:
* For sales phases 3,4,5 demand will increase dramatically since many people outside of Germany will be holding off on placing applications until they know they're team is in fact in the World Cup and what group they will be in. The draw for the World Cup is on 9-DEC-05.
* The USSF allocation of tickets will not all be CAT-4 or CAT-3 based purely on numbers. See this BS Soccer thread for a breakdown. This means that while you can probably get tickets through the FED, you may not get the cheap seats
* Also remember, that if you're looking for CAT-4 tickets, you can only apply for 2 tickets per match for 3 total matches so demand will be tight.
* The more US Supporters purchase tickets through FIFA, the more the demand burden is relieved on the USSF allocation.

At the end of the day, people are taking one of two strategies to obtaining tickets:
1) Waiting for the USSF ticket allocation
2) Applying for tickets during each of the FIFA ticket phases and using the USSF phase as a back-up

I rate your chances of getting tickets at 80% total based on US Supporters demand and USSF allocation. If you want to go on the cheap and refuse to pay for CAT-1/2 tickets, you're probably looking more like 50%

You wake up to realize that this won't be the case if you don't scalp your tickets from the English ticket touts roaming the streets before hand.

First off, the USSF gets an 8% allocation to all the US games. A few things we can probably assume:
A) Not all of those 8% will be sold to the general public
B) Not all of those tickets will be the cheap seats (Cat 3/4)

Secondly, when you apply for FIFA, you do in fact place the nation you're supporting for a reason. Now the nay-sayers will tell you that this is ONLY for determining the cap on TST tickets for a certain nation, but I disagree. You're actually going to get tickets that will put you near if not within the US Supporters. I'm an eternal optimist.

If the Portuguese can do anything, in my opinion its that they know how to throw a tournament. Their ticket organization in the stadiums was tremendous. I'm sure they didn't hire the English marketing company that botched Japan/ Korea 2002 ticket distribution.

None the less, what went well was that all the supporters of one team were seated together. They allocated the seats immediately behind each net (i.e. Cat3/4 seats). Then all the seats between the net and a section or two half way between the mid-field line and the penalty area were all supporters of one team. The opposite kitty-corner was for the other team. This way Cat 3/4's behind the net, Cat 2's in the corner, and several Cat 1 sections were garnered to a specific team.

Let's hope that the German OC has learned from the Portuguese.

The short answer is probably not, and if you can, you probably won't want to; the roaming fees are astronomical.

That doesn't mean, however, that having a mobile phone in Europe is out of the question. Phones are cheap enough now that for some travelers, it's worth buying a second phone in Europe to use while traveling.

In most countries, you can buy a phone for around 100 US dollars. You don't have to sign a contract; you can purchase pre-paid calling time. Local calls cost anywhere from 20 to 75 cents per minute, depending on where you are and the time of day. Incoming calls are usually free in Europe, so even if you don't make a lot of outgoing calls, having a phone gives you a steady number where people can reach you throughout your trip. When you're running low on pre-paid time, it's easy to "refill" your minutes at phone stores, news stands, grocery stores, and sometimes on your phone with a credit card.

If you plan to spend all of your time in one country, this works great. If you will be traveling in several countries, things get trickier. Each country has its own mobile phone networks. Once you cross a border from one country into another, your phone might or might not work. If it does work, you'll pay roaming fees that can quickly eat up your calling time.

If you want to use the same number in multiple countries, ask before you buy the phone what that company's roaming policies are: Will it work in other countries and if so, how high are the bills? Just like in the US, most European countries have competing phone companies. If one company's service doesn't work outside of the country where they operate, check with the competition.

There is a way to avoid European roaming fees. Outside of North America, nearly all mobile phones operate on a system called GSM (Global System for Mobile). All GSM phones contain a thumbnail sized chip called a SIM card. The SIM card determines your phone number. If you go to a different country and want a new number so you can make outgoing calls at the local rate, you don't need to buy a new phone. You can just buy a new SIM card to replace the original one.

Be careful if you do this, however. Many phone companies "lock" their phones so they will not accept competitors' SIM cards. If you plan to use a GSM phone in more than one country, ask if the phone is SIM-locked before you buy it. If it is, ask if they are willing to give you the code to unlock the phone so that you can use different SIM cards in different countries.

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