I'm still reluctant to look at hybrids seriously. I think they're a great idea but for two points:
size = safety. Sorry, but I travel a two lane highway and until they go back to shipping by rail I'm opting for what little size I can afford. No, a head on with a semi is not something I'll survive in my Altima either, but a lot of other types of collisions are more likely to be survived in my Altima than a Prius or Smart Car or whatever else tiny little auto they make.
Fuel economy: sounds like the Prius has a good handle on stuff, because a lot of hybrids such as the Ford Escape actually have lower highway ratings than their straight gas brethern due to the weight of the batteries. Prius must be the exception rather than the rule, though I'm curious to know what the fuel economy of the closest thing to a Prius (non-hybrid Prius?) would have been too. Of my 60 mile (one way) commute, about 3 miles is at 30 mph, the rest is at 60+.
Oh wait, there's a third point: it's freaking cold here in winter and I don't trust something electric to start up all that well. -30 C on a regular basis does a really good job of sucking all manner of battery to the point of being dead. I don't think the engineering on these batteries is up to life on the Canadian prairies yet.