This bundle isn't really a bundle (including the soundtrack doesn't count) unless you pay over the current average purchase price which is currently around $5.00, however if you do pay over the average (cheap bastards) you get Frozen Synapse along with everything from the original FrozenByte Bundle. This includes Trine, Shadowgrounds, Shadowgrounds Survivor, a beta version of the unreleased JackClaw as well as Splot whenever the get around to releasing it. I myself have purchased each bundle that has been released over the last few years and can vouch for the quality of the games, plus they're cross-platform and you'll also be supporting Child's Play & EFF. Besides, for 5 bucks (or more if you're not a cheapskate) what do you have to lose? :p http://www.humblebundle.com/
**update** The bundle now includes SpaceChem and Trauma.