Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
iStat is better IMO. Coconut does not work well with Leopard (from what I read here).

Coconut says I have a few more cycles than iStat and in System Profiler.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.