Here's two of my favorites that have to do with the WM connection bubble:

; Enable Disconnect button and timer in data connection notification bubble
[HKEY_LOCAL_MACHINE\ControlPanel\Phone]
"Flags2"=dword:00000010

; Disable pop-up notification bubble when starting a wireless data call
[HKEY_CURRENT_USER\ControlPanel\Notifications\{8ddf 46e7-56ed-4750-9e58-afc6ce486d03}]
"Options"=dword:00000000