I've migrated all the blogs to MT3 now, and so far the anti-spam plugin SpamLookup has done an even better job than MT-Blacklist did, sparing us from almost all comment and trackback spam.
There's still some detail work left for the various bloggers to do, to re-create the formatting customizations that I didn't bring over. Thanks to everyone for their patience during the transition.

Thanks, RC!
Sorry to hear about the troubles. Glad to see you're all back online.
BTW - I finally switched to a new web host earlier in the year because the host I was on kept doing stuff like you related in your earlier post. I went host hunting and found TotalChoiceHosting - the support is excellent and as best I can find you can't beat the price.
There's also a very active support forum (they even talk about MT (one of the TCH gurus is pretty knowledgable on MT). You might check it out at http://totalchoicehosting.com/
John