I've transferred my webpage domain file from my imac to my macbook and everytime I open iweb it asks me if I want to join mobile me and I already seemed to be signed in. My page shows up but it won't publish to the site?
What happens if you exit iWeb, go to your .Mac or MobileMe system preferences, sign out and then back in and try to re-publish from iWeb? And have you tried the option to Publish All to MobileMe instead of just Publish?