I'd really like to know for myself! We only know the offiicial statements by Apple to the end of Mobile Me - you should have received an alert by now to save your MM content - this have been sent to all users last weekend and includes a download link for your web content.
iWeb will still work after the end of Mobile Me; so you will still be able to use it to create web sites - publish to your disk or upload to a site with FTP access. Aperture web galleries I export to my disk and upload via FTP (Cyber Duck)
See this site by Roger Wilmut for your options:
Migrating from Mobile Me:
And if you want to continue to use iWeb, see this fix by Old Toad and Roddy McKay:
Modify the iWeb Application: http://oldtoadstutorials.net/No.26.html