I have a test build that may fix the m logo boot loops, but it hasn't been tested. I have had the m logo boot loop occur once, but it is not repeatable on my phone, so I can't verify if this build fixes it or not. I have given it out to a few, but none have reported back if it works or not. Since so many are having this issue, I will post it here.
It may be able to be installed on top of 1.6.3.0 (wipe cache though!), but again that hasn't been tested. If it doesn't work that way, please try it again wiping data and cache. This build installs fine on my droid, but that is the only one it has been tested on.
Miui.us-Sholes 1.6.3.1:
http://bit.ly/kvKKtL
md5: 47361875408700e749241b73711a6e45
I have added QuickOffice from the OG Droid, but it is installed in /data/app so it can be easily uninstalled if you want. Other than that and the (fingers crossed) boot loop fix, this build is identical to 1.6.3.0 so all of the same known issues apply.