XP Repair Pro has a nice list of tools to repair and speed up your computer. There's a Registry Cleaner, Registry Defrag, Startup Manager, Registry Editor, and Hard Drive Cleanup. In addition there is also a tool to anonymize your internet web surfing. How many system optimization tools honestly have that? Not many.
As far as the tools itself, they seem to perform fairly well. Tests on the Registry Cleaner only found it to be about average though. However, I think the additional tools certainly make up for it.
My recommendation? Go ahead and try this software out. It may be perfect for you.
Pros: Nice feature list, Has an Anonymous Internet feature, free 15 day trial.
Cons: Registry Cleaner just seemed about average