The article I linked to mentions there was actually a previous cancellation, making Laughlin the second show to go belly up this season. The first was a show called Online Nation on The CW, featuring teens talking about what's cool online, and after doing a little digging I discovered it ostensibly aired Sundays at 7:30 PM, but I've decided it doesn't count because I've never even heard of it. That's how the TV Nerd rolls.
However, it turns out the exclusion of Online Nation doesn't matter. Viva Laughlin is indeed the second show of the 2007-2008 season to get the axe after all. What was the first? Fox's New Amsterdam, about an immortal NYPD officer. Intended as a midseason replacement, it didn't even make it to midseason before it was scrapped. So, technically, the first canceled series of the season never even made it onto the air!
The countdown for Caveman and Moonlight continues. I think it's only a matter of time.