There's a nice one in the list called dBpowerAMP. It's free except LAME MP3 expires after 30 days, it has to be registered to reopen. If you're using OGG for your music files(which you really should be), then that doesn't matter.
There's a read/write codec, available, for just about every audio format you'd probably ever need.
My User Contributions master list - my initial post links are down but scroll down page to find list to active links
