This updated SMS/MMS app has been patched to fix the following issues:
Sms sent to wrong recipient' bugs - See here
Notification goes to conv list bug - See here
Picture Message size for O2 and giffgaff customers (by changing user agent to iPhone 3) - Discussed here
Attached is a zip for flashing via recovery (Clockwork / AmonRA / etc)
ClockworkMod 3+ users use the CWM3 version
This patched version is based on the Cyanogen Froyo 2.2.1 SMS/MMS app.
Props should goto xaueious for rolling in the patches.
Working great on my phone, should be ok for all Froyo devices