Here is a notification utility smartWatchM for Sony Ericsoon BT watch (MBW-150). It supports all main features of Sony Ericsson phones and it even has some extra functions.
It’s developed for Smartphones/Windows Mobile Standard but works on all WM 5/6 devices (with MS BT stack).

Changes:

– fixed compatibility with new version of Pigeon (IM)
– fixed appointment notifications on PPC
– fixed backlight/power management on Samsung devices (both SP/PPC)
– added out of coverage (carrier/network provider) notifications – set NotifyCoverage to 1 in registry

http://forum.xda-developers.com/showthread.php?t=362218