System Mechanic, by Iolo.com, has a nice Registry Cleaner in it. But it basically does the same as the others mentioned. I like it because it has other features included. A nice Maintenance utility all around. It is around 45-50 dollars, US. They just released a CD Version that runs off the CD and doesnt need to be installed! I have been eyeing this, but afraid that is all it is going to be... eyeing. It carries a nice hefty price... hehe.