Weee're baaack. Sorry that comments and posts were not do-able for a while there. No idea exactly what went wrong, but mySQL's "repair table" command works more often than not, fortunately.
Oh yeah: If you've been monitoring comments on some particular post and all of a sudden they've disappeared, let me know: stopmebeforeivoteagain (at-sign) yahoo.com. I may be able to recover them.