I put a couple of these hacks into place, as well as downloaded the most recent update from Motorola.  I've found that the cache changes, and new ROM have definately speed up my Motorola Q, but battery life is still about 1 day... not the 1.5-2 days I had hoped, but that also might be an activesync config issue as well.

I use RegEditSTG -- which is a stand alone .EXE that I put on my Storage Card, so its available and portable. :)
http://wiki.everythingq.com/page/Motorola+Q+Hacks

Here is one of the good hacks... I haven't got it to play one of my .WAV files yet, but atleast it doesn't make a ton of noise now.

http://wiki.everythingq.com/page/Eliminate+the+Windows+Startup+Sound+hack

There is also a new Software Update for the Motorola Q.  Goto this site and Download it.