1: Stay rooted and enjoy all the ROMs available to to now, even if you just flash in the "virgin" rooted FRG01B ROM kicking around.
2: Ask someone over in the rescue squad for help. I'm sure there's a way to unroot using ADB and if they could cram the first FroYo leak onto Hookbill's phone without rooting him they could probably fix you up... but you'll probably have to uninstall Bugless Beast first.
3: Wait for DMUpdater to be released officially and use it to unroot. You'll have to flash in a stock ROM to allow the update to take.
There's a fourth option, but I doubt you'll like it...
(Ask a friend with a PC if you can borrow it for a while so you can RSDLite your phone from there.)
There may be other options but I think I've covered the main ones. Good luck and let us know if there's anything else we can do.