http://soundkey.com : Will ideally become something like the Wikipedia of sounds (i.e. a central repository/global reference about anything that has to do with sounds)
Really cool idea. I have some feedback after visiting your site. "wikipedia of sounds" is not at all how I would describe it. It's more like "twitter for sounds".
When I arrived at your site I was really quite confused as to what the hell soundkey did. The main part of the site shows a big list of social networks, and says "use soundkey here" ... Ok... but what exactly does soundkey do?
I would focus more on the aspect that you can record sounds and then link to them (or embed them). It's really that simple, but you've managed to overcomplicate it and it took me way longer than it should have to figure out the following: Soundkey lets me record a sound, then link to it.
My suggestion: put the record tool right smack in the middle of the front page. Make it the primary purpose of the site. That is, I should be able to go to "soundkey.com" and conveniently record and share a sound, rather than seeing a splash page. You don't visit bit.ly and see a whole page explaining the benefits of short links, and where you can use shorter links. You see a textbox that you can immediately use.
At any rate, this all might sound very critical, but I love your idea. Put that recording thing front and center, emphasize "record sounds and share them" [twitter for sounds], and your users will figure out the rest.
We are currently working with a UX expert to help us re-design the look & feel and the functionality of the website, and the issues you bring up have been brought to our attention and will be addressed in the next iteration of the website.
(We currently do have a "How this Works" section on the front page that says "Record Sound, Get SoundKey, Use Anywhere" with an explanation of what that means, but I guess it's not clear enough because lots of people complain about it. Hopefully the updated website will make things much more clear in much less time)