Frozen Synapse now has a demo, which totally demolishes any excuse you might have made to not try this turn-based combat thingum. Other reasons to pay attention to it include this preview essay by Gillen, this AAR by Gillen, and this review by Meer.
Those are our endorsements. We stand by them. Also: Steam will be offering Frozen Synapse at 50% off from Thursday 11th August to Monday 15th August.