There is a new humble bundle out http://www.humblebundle.com/
MOD EDIT: To add some additional info and merge conversation about this bundle into one thread, here's what user evilrazer posted about the Humble Frozen Synapse Bundle in a thread he created:
Pay more than average payment and get:
- Shadowgrounds: Survivors
- Jack Claw
These Humble Bundles are usually really nice deals, so feel free to discuss them in this thread!
In addition, if you find you really like Frozen Synapse and want to find other Giant Bomb users to play against, you might consider looking at this slightly-dated friends list thread. -PsEG