[G2 and Desire Z Android Development] ajhavery:
Here's a list of things being erased:

"/system/app/AppSharing.apk"

"/system/app/BackupRestoreConfirmation.apk"

HTC Skins:

"/system/app/Aluminium.apk"

"/system/app/Serene.apk"

"/system/app/Graphite_2.0.apk"

"/system/app/Matte.apk"

"/system/app/SpaceshipEarth.apk"

"/system/app/Steel_2.2.apk"

HTC Widgets:

"/system/app/Htc3DRichNotesWidget.apk"

"/system/app/CalculatorWidget.apk"

"/system/app/GenieWidget.apk"

"/system/app/HtcFMRadioWidget.apk"

"/system/app/HtcFriendStreamWidget.apk"

"/system/app/HtcMsgWidgets.apk"

"/system/app/HtcMusicWidget.apk"

"/system/app/HtcSyncWidget.apk"

"/system/app/MyTaskWidget.apk"

"/system/app/HTCTrendsWidget.apk"

"/system/app/HtcTwitterWidget.apk"

"/system/app/FusionStockWidget.apk"

"/system/app/HtcAutoRotateWidget.apk"

"/system/app/HtcBackgroundDataWidget.apk"

"/system/app/HtcBookmarkWidget.apk"

"/system/app/HtcCalculatorWidget.apk"

"/system/app/HtcCalendarWidgets.apk"

"/system/app/HtcClockWidget.apk"

"/system/app/HtcContactWidgets.apk"

"/system/app/HtcCOTAClient.apk"

"/system/app/HtcDataRoamingWidget.apk"

"/system/app/HtcDataStripWidget.apk"

"/system/app/HtcFootprintsWidget.apk"

"/system/app/HtcGreaderWidget.apk"

"/system/app/HtcMailWidgets.apk"

"/system/app/HtcQuickLaunchWidget.bak"

"/system/app/HtcPhotoWidget.apk"

"/system/app/HtcPowerStripWidget.apk"

"/system/app/HtcProfileWidget.apk"

"/system/app/HtcRingtoneWidget.apk"

"/system/app/HtcScreenBrightnessWidget.apk"

"/system/app/HtcScreenTimeoutWidget.apk"

"/system/app/HtcSettingWidgets.apk"

"/system/app/Htcwatchwidget.apk"

Rosie and other Useless apps:

"/system/app/DFPI.apk"

"/system/app/DockMode.apk"

"/system/app/DrmProvider.apk"

"/system/app/FalloutTweaks.apk"

"/system/app/FriendStream.apk"

"/system/app/fusion.apk"

"/system/app/fusion.bls"

"/system/app/GSD.apk"

"/system/app/HtcDMC.apk"

"/system/app/HtcFeedback.apk"

"/system/app/HtcFootprints.apk"

"/system/app/HtcGreader.apk"

"/system/app/HtcImageWallpaper.apk"

"/system/app/HtcLockScreen.apk"

"/system/app/HtcResetNotify.apk"

"/system/app/HTCSetupWizard.apk"

"/system/app/JETCET_PRINT.apk"

"/system/app/JETCET_PRINT_Resources.apk"

"/system/app/LMW.apk"

"/system/app/MySketcher.apk"

"/system/app/Picasa_GLRplugin.apk"

"/system/app/PluginManager.apk"

"/system/app/PrivInit.apk"

"/system/app/Rosie.apk"

"/system/app/SDCardWizard.apk"

"/system/app/SetupWizard.apk"

"/system/app/Stock.apk"

"/system/app/talkback.apk"

"/system/app/Updater.apk"

"/system/app/WatchApp.apk"

"/system/app/WifiRouter.apk"

"/system/vendor"

"/system/media/weather"

"system/media/oobe"

"/system/usr/srec/en-US"

HTC Weather:

"/system/app/Weather.apk"

"/system/app/WeatherLiveWallpaper.apk"

"/system/app/WeatherProvider.apk"

"/system/app/WeatherSyncProvider.apk"

"/system/app/WeatherVideo.apk"

"/system/app/WeatherWidget.apk"

"/system/app/HtcWeatherWallpaper.apk"

"/system/app/HtcWeatherLiveWallpaper.apk"

HTC Lockscreen:

"/system/app/com.htc.idlescreen_SN.apk"

"/system/app/Idlescreen_Base.apk"

"/system/app/IdleScreen_People.apk"

"/system/app/IdleScreen_Photo.apk"

"/system/app/Idlescreen_productivity.apk"

"/system/app/idlescreen_shortcut.apk"

"/system/app/IdleScreen_stocks.apk"

"/system/app/IdleScreen_Weather.apk"

HTC Notes:

"/system/app/HtcNotes.apk"

"/system/app/HtcNotesPainterView.apk"

"/system/app/HtcNotesProvider.apk"

"/system/lib/libnotes_jni.so"

"/system/lib/libnotesprovider_jni.so"

HTC Task:

"/system/app/MyTask.apk"

"/system/app/MyTaskWidget.apk"

It has AOSP Lockscreen.

Whatever things you wish to keep, just remove the line containing it from /META_INF/google/android/updater_script.

Open the zip with winrar and remove the lines containing apps you wish to keep.