What do you like, dislike and/or would like to try? Might be helpful to know the make/model of your wheelset and whether most of your rides are in hilly or flat areas.

1) Mavic Cosmic Carbone 40s
2) Hilly
3) Like: Swiss Stop FlashPro Black Prince. Excellent stopping power in the dry. They aren't exactly inexpensive and I only get about 400 miles per rear pair (600 for the front), at which point I replace them.
4) Dislike: Kool Stop Dura-Type carbon. These wear about 2x faster for me than the BP pads. Dura-Type 2 pads are supposed to be thicker, but haven't tried them.
5) Would like to try: Swiss Stop Yellow King or FlashPro Yellow. I've heard these last longer than BP pads but leave yellow residue and utilize an older compound with reduced stopping power.