OH - found this
http://www.lvlolvlo.net/PDA/MDA/
* CAB-Customization-PictureSize2Default.CAB Looks harmless, just reg entries
* CAB-Customization-Wizard(AKU1.0)-TMOUSA-01-09-051215.CAB MMS settings, definitely install
* MT-MMS-WI19-051213-1.CAB More MMS settings
* Shorcut-MMS1-CV-VOICE-TMO-US-10Nov05.CAB Mixed items, some MMS settings
* Signed_CAB-Customization-SuspendResume-TMOUSA-Wizard-Aug10.CAB Wap settings for suspend and resume
* Signed_CAB-Customization-WapPush-TMOUSA-Wizard-Aug10.CAB Something to do with messaging
* Signed_DiscoButton8.sa.CAB Allows you to disconnect GPRS with a button
* Signed_GPRS-stall_Wizard_TMOUS_DEC20.CAB GPRS dll's
* Signed_TMO_USA_CommManager_0409_v101.sa.CAB Updated COMMManager, definitely recommended
* Signed_tmobile_email_notification_2005PPC_NET_rom_12202005.CAB Email Triggers
* Signed_TMOUS_Favorites_1810102.sa.CAB TMO IE Favorites. Kinda interesting, could go either way.
* Signed_TMOUS_MCCMNC.sa.CAB Some sort of TMO settings. Not real sure so I left them
* Signed_TMOUSA_Connection_Wiz10810101.sa.CAB GPRS settings
* Signed_TMOUSA_FixAppButton_VoiceSpeedDial.sa.CAB Just a link to the speed dial, not the install itself.
* Signed_TMOUSA_Setting_pIE_Wiz10810102.sa.CAB Harmless TMO settings
* Signed_UXC_HotFix_Wiz10510101.sa.CAB Sets default page for PIE
* Signed_Version.sa.CAB Sets ROM version
* Signed_WIZ_RILEnableEONS_2.sa.CAB
* SmartDialing_enable_0915_signed.CAB VoiceDial
* TMOUS_Camera_Profile_reg_0908_signed.CAB Camera Settings
I am NOT installing these:
* PhoneLight_Skin_TMO_US_1124.CAB PhoneSkin-waste of space
* PhoneLight_TMO_OverBMP_1124.CAB PhoneSkin-waste of space
* Signed_Move_IM_Link.sa.CAB SMS based IM
* Signed_OZPocketPC.Cab SMS based IM
* Signed_Update_RingTone_1810102.sa.CAB TMO ringtone
* UXC_WWE.cab TMO branding of PIE and TMO sounds
* Signed_2005_11_24_TOHTC_wispa_PPC_Release_v1_0_1_1.CAB TMO hotspot settings.
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Now the last one "Signed_2005_11_24_TOHTC_wispa_PPC_Release_v1_0_1_1.CAB" is really up to you...if you have the hotspot service then go for it...if you don't then don't bother.