smaw, the newest Mathews z series bows are basically refinements of the SwitchbackXT's parallel limb design, which was revolutionary around 2006.
The Mathews Chill incorporates the 'dual-solocams' and floating yokes of the Monster series bows into a smaller, more forgiving package.
Elite bows' binary cam system is said to be extremely forgiving, but not known for producing high IBO speed. They've been re-making the same winning bows for a few years now, too.
Bowtech and Hoyt are offering carbon risers to shave weight and offer lots of different bows for particular shooting needs.
PSE still appeals to the speed freaks, netting some of the highest IBO speeds.
Prime bows base their line on a two track, "parallel cam" system that is pretty revolutionary by addressing the issue of 'cam lean' found in many other bows.
And there are several more smaller 'boutique' type bow makers who are trying to compete the the bigger names...Strothers, Athens, New Breed, Obsession, etc.
For the most part, I think compound bow technology is coming to a head...