The best way to do this is to upgrade using this particular ROM. This is the EXACT SAMES Froyo FRG012B that is going out OTA. The only difference between this and the OTA is this one will not remove your root. It is also a signed Verizon version of the OTA
http://www.droidforums.net/forum/dro...tml#post713153
Just download Jrummy's link, change the name of the file to Update Zip. and install with SPRecovery. It's that simple.
I've been running it for about a week now with no issues. Everything works great and I'm not running any custom ROMs. I am oaverclocked to 1Ghz and running P3's 250/1100 kernel.