Note: If you've got an invititron URL (say, from my amazoniversary party), use that for signup instead of just your email. It allows the system to link to your invitotron account, which it may make use of later (allowing you to pre-create/auto-create requests for parties, etc)... If you can't find it, go ahead and use your email address, we can link them later.
Thanks everybody who helped me test it. All should be properly usable now. Let me know if you run into any problems.