Rod Gibbons has a site full of information geared around catamarans. He has many power and sail designs that may be worth a look.

His site has a lot of information and gives an opportunity to subscribe to a newsletter that looks to be interesting.

In keeping with the smaller, handier, maybe trailerable trend, check the Motorcat 29. One of the few power catamarans that I have ran across that looks more like a monohull than a cat (which for whatever reason just never look quite like I like)... yes, that's being shallow (low draft??? :-), but looks are part of a boat.

Cats can have some good advantages (fuel economy for a given speed is usually one example). On the flip side they must watch their weight a bit more closely than many full displacement monohulls. Trade-offs, trade-offs.