Here is a list so far of what I have delete off the phone. You should try to use android mate or root explorer to copy off the files to a sdcard for backups
MVC.MetroPCS.android02.apk = Virtual Card
MobileBanking.apk = Mobile Banking
MobilePosse.apk = MyExtras
SNS.apk = Facebook for LG, Twitter for LG
Boingo_Wo-Fi.apk = Boingo WiFi
Mocospace-1.2.4.apk = Moco Space
Uno_Demo_LG_MS690.apk = Uno Game
PGA_Android.apk = Free Games
LGMS690_MetroPCS_EasyWiFi_V4.0.90.apk = Easy Wifi
MPCS-MobileIM-0.4.24.2.apk = MobileIM
PEX-3.1.1.1-metro-rc.apk = Pocket Express
z7-android2x.apk= Mail@Metro
Also as an FYI...once I removed the MetroPCS Easy WiFi....my battery life has suddenly increased.
As I said in this post:
http://androidforums.com/lg-optimus-m/227036-new-lg-optimus-m-ms690-root-achieved.html
SNS.apk is the only one that doesn't reinstall correctly.