If you remove the queries for total posts, total threads, members, newest member, birthdays, avatars for welcome panel, WOL, that will lose you about hmm, 8 queries on forumhome...
forumdisplay, probably the wol there, and i dunno what else.
showthread, just get rid of everything apart from usernames in the postbit! So you can still see who's posting, and what they're saying!
hehe