Anyone know of a decent free converter I can grab?
If you just need to do conversions:
http://mediacoder.sourceforge.net/
If you want to do any kind of editing, Audacity is probably the best freeware sound editor out there.
http://audacity.sourceforge.net/
Audacity also supports the VST audio plug-in format (to a degree), which will give you a lot more options if you want to get creative. You can find a lot of free vst plugins here:
http://www.kvraudio.com/
Excellent, thanks Goggles.
I second Audacity, I use it to create my fallout 3 radio stations.
And I use Audacity for my podcast... y'know, when I get around to recording it.