I do like Plexamp, it's a really nice little app sitting in the bottom right of my screen.
A couple of feature requests:
Choosing the output source. I often listen with my headphones, but Plexamp always seems to want to play out of my iMac speakers instead. Can we get a way to change that?
Browse library. I know the whole idea of plexamp is to be small. Not include all the heavy features. But unfortunately I have a large library, and often I can't actually remember what I want to watch. Would be nice to see a tiny grid of albums or artist images so I can drill down and remember which songs I wanted to listen to.