They don't disallow Tor explicitly; it's just that spammers often hide behind Tor, so sometimes a Tor exit point's IP will be banned. To get around it, just have Tor use a new identity until you get one that isn't banned.
You've gotta be kidding me! A few clicks on Vidalia, and I could have avoided having to create a whole new identity for myself. Oh well; my registration is forever tied to a point on Big Brother's graph of IP vs time.
Shou ga nai. I only offer legitimate services anyway. I'm just a wannabe crypto/privacy buff. ChocolateSoda's got a nice ring to it. I just tried some yesterday (the bottle was on my desk earlier) and it's probably the best thing.