Interesting, I've been experiencing the opposite - all my CPs have been doing great this year (except my VFTs). Although it could just be because I'm new to carnivorous plants and just got my first ones in the summer of 2010, and I started out with smaller plants that were expected to grow more. For example, when I got my S. minor last year, it had 5-6 pitchers - this year it put out 26 new pitchers (and counting, it hasn't slowed down its growth), flowered, and looks like it's about to split the 4" pot it's in. My S. purpurea made two flowers this spring, and while it got a late start on pitcher growth and didn't put any new ones out till July, it now has more than it did last year when I got it. For all my other Sarracenia (I got a whole bunch this year), and my Darlingtonia, this will be their first winter with me, so I'll have to wait and see how they do next year.
I think one reason why my plants have been doing well is because I have them up on a deck 20-25 feet above the ground. The deck heats up pretty fast as long as its sunny, even in winter, and that combined with the fact that they are in a black tray means that their roots are usually pretty warm like they would be in their native habitat. I think the fact that they are so high up also prevents a lot of pests that would infest ground-level plants (like worms, as Bill mentioned). That said, these past two summers have been unusually cool in California, so that probably contributed to the lack of growth seen by many members here. Strangely, elsewhere on the continent, they seem to have had an unusually warm summer this year...