SciFi Wire thinks that CBS' Threshold may have bit the dust:

CBS has pulled its SF drama Threshold from the schedule for at least the next few weeks, following a lackluster ratings performance in a new Tuesday timeslot, Zap2it reported. Sources told E! Online that the show has been canceled; a CBS spokesperson couldn't be reached by Zap2It to confirm that.

That would be too bad, IMHO. While the premise of the show is "out there" (an alien signal can reprogram DNA), there's one big thing going for the show: there's no "evil government conspiracy" plotline. I'm getting kind of tired of that one, especially since X-Files beat it until it wasn't only dead, it's ancestors were begging for mercy. "Surface" has that conspiracy thing going (although, to be fair, there are so many defects in that show that picking on just one seems unfair).

Ultimately, I rather like the way "Threshold" depicts the ad-hoc government group fighting the alien incursion - they make stuff up as they go, trying to hold to a set of policies laid down by the show's protagonist. It seems a lot more realistic to me than a shadowy cabal that "really" runs things.