I think I agree with Rad and Trogon. It's not necessarily the material that makes a good frame. The engineering that is involved with using the material to its optimal properties is the most important. The companies who spend the most effort on squeezing every gram of potential out of the material/alloy/composite they use is who I'm going to buy my frame from. There is also a combination of other factors, such as still ending up with a product that looks nice enough for people to buy it. I honestly think that CF has the most potential with its ability to change properties in different axes and also its sexy shapes (Kestrel particularly) but it costs a whole lot to get all the potential out of CF. Pretty good bikes can be made of any of the materials used now, and for nearly the same price. But I think the other guys were already saying things like that.