First, thanks for your job, I've justed discovered Winamp for Mac and it's really a nice job.
Then some feedback... :
So, first, I have a huge library and a lot of unknowned artists in. So I prefer to have a list of Genre, Artists, and Albums like in iTunes or other music players. The Search function works perfectly but it's sometimes quite difficult to play an album quickly. You have to sort by album and then by track number (and sometimes by album number) to play it with the original order.
Secondly, I can't play any Flac or OGG files. Same like with iTunes without external softs. But maybe you have planned it?
Finaly, 'Love your Play Queues, it's really missing for me in iTunes and lot others on Mac.
EDIT: Also, an auto cleaner of deleted or duplicated files in library will be welcome