Hopefully this is happier indie price-experimentation news than the below... What began as really little more than pay what you want for one game - that being Frozen Synapse - has been slowly expanding to be some games, as appears to be Humble Bundle trends. You'll be very glad to hear that the very, very good Space Chem is the latest addition, joining Trauma which was bundled in earlier this week. And yes, this works retroactively for people who already bought the FZ bundle. So, whatever you have given or are prepared to give, you'll end up with FZ, SpaceChem and Trauma - and if you beat the average price you also get a package of Frozenbyte games to boot.
All the games are available in PC, cultist PC and hippy PC flavours, by the way.
If you don't know what Space Chem is, then boo. BOOOOOO. And also read this.