I'm having a blast with Caustic 2. For a while, I've been thinking about getting into chiptune production, but I found working in most actual chip tune editors too restrictive. I do like working within constraints, but I just didn't like the totally different workflow of things like LSDJ. Caustic does lots of the things I like, but it doesn't have endless pools of samples and effects to wade through (so much as, say, Reason). It immediately lends itself to work on crunchy grooves - all about simple synths and drums with a few effects. I can just take a few minutes wherever I happen to be to work on making cool patterns and rhythms. Good wholesome audio fun.
EDIT: scroll down for more tunes, which I'll keep adding to this playlist.