I personally use PHM Registry Editor for my regediting. To be fair though, I've never used any others, so I wouldn't know how it compares. I've never had a complaint though.
There are a couple good sites for tips and tricks...
The everythingq hack thread of course:
http://www.everythingq.com/forum/mot...acks-1037.html
tips, no hacks:
http://cellphoneforums.net/motorola/...ps-tricks.html
There are tons of threads out there. Basically, think of something you want to do and google it. You'll find lots of resources. There are even a few that potentially enhance the speed of your Q. Be very careful with those though, because those have the highest likelyhood of bricking your Q. Also make sure that you use hacks that work for the Q9h. There are some out there that are different per phone model and/or don't work at all for one or the other.