Just to let everyone know (if you don't already), EQ2MAP auto updater works flawlessly in Windows Vista after a clean install and no added software updates (ei: .net). So for those who are planning on upgrading to Vista when it comes out, there is nothing to worry about EQ2-wise; I've been running both the game and the map updater for the past few weeks without a hitch!
EDIT: And UIBuilder works completely normally too!