Winamp for Android beta is full-featured and offers wireless media sync
Winamp for Android's key feature -- and indeed, the only real feature that it brings to a very saturated media player market -- is that it wirelessly syncs with your desktop Winamp music library. You can also sync via USB (which is a lot faster). I ran into a few issues trying to sync with Wi-Fi, but it did eventually work.
Nullsoft's offering doesn't bring a whole lot more to the party. There is a desktop widget, so you can control your music without having to open Winamp -- and it can also hook into your phone's lock screen, which is neat. The playback controls are available at the bottom of every screen, too -- so whether you're curating a playlist or searching through albums, you can still stop and start the music. Oh, there's Last.fm scrobbling too!
All in all it's a very promising start for Winamp on Android. It's not mind-blowingly awesome, but if you use Winamp on the desktop, this app is surely a must-have.
Check out the gallery below for a better idea of the 'omnipresent' playback controls, and the wireless sync.
[Oh, and to answer Engadget's question: yes, it still whips the llama's ass.]