MOTM

I'm in the process of generating some demo file for the frequency shifter
and I'm currently using the crappy Windows Recorder. I would like a
recommendation on a WAV to MP3 converter that is:

1. Easy to use
2. Inexpensive or better yet: free
3. Relatively bug free

I don't have the time to go trying out all sorts of freeware, so I was
hoping someone on this list has already found something good.

Thanks,
Tony