As of December 2 this year, MP3.com will no longer be online to feed your hunger for unsigned bands. CNET Networks has bought the whole enchillada and will probably try to divert as many users as possibly to other services.
If you are one of the lucky ones to still actually be an active member of MP3.com you may want to take screenshots of what-ever page you have made; on December 2 the site will no longer be accessible.