First off, I am running Rubix 0.5FocusedPATCHED with BBC Dark Status Bar and Clear Lockscreen on the official 2.2 OTA.
Here is the list of system apps which you "NEED":
THIS IS WHAT IT LOOKS LIKE FROM TITANIUM BACKUP. I RECOMMEND EVERYONE USE TITANIUM BACKUP.
As always, make sure you do a nandroid backup first. If anything goes wrong, you can either place the systemxxxxxx.apk into the /system/app folder, set the permissions and then reboot the phone. If it is a critical app you removed where you can't even turn on the phone or even open up root explorer and copy and paste the needed xxxxxx.apk into the /system/app folder, just do an "advanced restore" of "only" the /system from clockworkmod.
Account and Sync Settings 2.2
ADW.Launcher 1.1.5 standalone MAKE SURE you have at least "1" Launcher.
Battery Manager 1.1
[BOOKMARKS] Browser 2.2
Calculator 2.2.1 You don't really need but why not...
Calender 2.2.1 You don't really need but why not...
[CALENDAR] Calendar Storage 2.2.1 You don't really need but why not...
Calendar Sync Adapter 2.2 You don't really need but why not...
Camera 2.2 You don't really need but why not...
Certificate Installer 2.2
[ALARMS] Clock 2.2.1
[USER DICT] com.android.providers.userdictionary
Compass Calibrator 2.2
Contacts Storage 2.2
Contacts Sync Adapter 2.2
Cool Down Mode 1.0.0 Only for the Rubix ROM. Leave it installed.
Country, Language, Time zone
Data Manager 2.2
Data Manager Service 1.1
[VOICEMAIL] Dialer 2.2
[SMS/MMS/APN] Dialer Storage 2.2
Download Manager 2.2
DRM Protected Content Storage 2.2
Droid Eye 1.0
FM Radio 2.2 You don't really need but why not...
FM RadioService 2.2 You don't really need but why not...
Gallery 2.2 You don't really need but why not...
Google Backup Transport 2.2
Google Partner Setup 2.2
Google Services Framework 2.2
HTML Viewer 2.2
Market Updater 1.0
Media audio Effects 2.2
Media Container Service 2.2
[PLAYLIST] Media Storage 2.2
[SMS/MMS PREFS] Messaging 2.2
Multi-touch keyboard 2.2 Just make sure you have some sort of keyboard.
Music 2.2.1 You don't really need but why not...
My Uploads 1.5.9
Network Location 2.2
Package Installer 2.2
Pico TTS 1.0
Programming Menu 2.2
[WALLPAPER/SETTINGS] Settings 2.2
[SETTINGS/BLUE] Settings Storage 2.2
Settings Storage 2.2
Setup Wizard 1.3
TTS Service 2.2
Video Player 2.2 You don't really need but why not...
Voice Readouts 1.0.2 You don't really need but why not...
Youtube 1.6.21 You don't really need but why not...
Zoom Mode 1.0.2 You don't really need but why not...
Wi-Fi Access Points
I then proceed to disable all NON-CRITICAL 3RD-PARTY applications from starting automatically with AUTOSTARTS! I have about 240MB of system RAM free!!!
Remember, this is only if you don't mind not having BLUR and its widgets and stuff. Also, it gets rid of some other pointless Android sytem apps.
My phone flies now, and my battery life is insane!!!
PS. A little extra tidbit of info for you.
In Spare Parts:
1. Set "Window Animations" to "Fast"
2. Set Transition Animations" to "Fast"
3. Check Fancy Input Animations
4. Check Compatibility Mode
In ADW Launcher:
1. Under Screen Preferences, set "Desktop Scrolling Speed" to "0"
2. Under Screen Preferences, set "Desktop Overshoot" to "0"
3. Under System Preferences, check "Wallpaper Hack"
4. Under System Preferences, make sure "Auto" is selected for "Scrolling cache"