Jason,
The quickest and easiest way is to increase the texture size. All of my models now use 1024x1024 and if the photos I use for the textures have a high resolution (2000+ pixels wide) the body of the model is split in half and textured accordingly from a single 1024 texture. This is the texture for one of my cattle wagons which will help explain what I am talking about
Top section is for the left side of the body, bottom section is for the right side of the body. Of course this wont work for all models but for most it would be the best way to go. I'm planning to use 2048x2048 textures for my next projects; the results are super sharp textures with no noticeable performance hit.
Cheers,
David.