While your checking out
www.sonicbids.com, another suggestion:
Clear Channel New Music Network This site is free, and it's functionality is sort of like MP3.com for music industry suit and tie types. I submitted an artist in full a few months ago, and have already received quite a bit of positive feeback and reverberations from the submission. You can upload MP3's, biographies, copyright info, photographs etc. and in your profile options, select what type of industry your planning to solicit to (be it licensing, radio, management) so it may be filtered into the different subcatagories. It pretty much caters to every niche as well, so it's worth the half hour of uploads from what I've witnessed thus far.
OK, there's my do-it-yerself promotion input for the day.