I asked on a forum about RPGA accounts and got the following info. I tried it out, and its not working for me, but maybe someone else might have luck with it.

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If you're logging into your account for the first time, you will have a default password assigned to your account. This default password uses one of two patterns:
1) If you mailed in your membership card a few weeks (or more) ago, and are logging in, your password should be your state abbreviation+zip code. So, if you're in Beverly Hills, CA 90210 your password is "CA90210"
2) If your account just became activated by playing in an event and your GM entered your account the default password is "WA98055" (The State+ZIP for Renton, WA, where Wizards of the Coast is located).

Also all rpga numbers have been changed as of this month:

In August 2008 the RPGA and DCI databases were merged.
As part of this merge, RPGA numbers were incrememented by 100000000 to avoid conflicts with DCI numbers. At this time all RPGA numbers are at least 9 digits long (newer numbers are 10 digits long).
So, if you were RPGA# 1234 before, you're RPGA# 100001234 now.

Bebarce: Yeah, I saw the post on the Penny-Arcade forum last week and tried it out to no avail.

Joe: I had tentatively told Scott I would run an LFR thing when my RPGA stuff went through and I could look over what was going on with it and what I was getting myself into. I do have some pretty severe reservations about running anything in FR though, due to the extensive history and my ignorance of the setting. After skimming through the Campaign Guide, I think the setting has a lot of potential, but again, the history side of it in a shared world is rather daunting, not to mention my reservations on shared world settings and the politics that tend to plague them. I might try and finagle an RPGA game that is not LFR however, and might be down with running a living eberron setting if that ever happens in 4e.