Palm has released a ROM update for the Cingular (now AT and T) Treo 680, which offers the following improvements (some already found in previous patches for the Treo 680):
Improved power management for better battery life.
Camera update for improved battery life (available previously as a standalone update).
Helps correct distorted characters that can occur in the title bar of the Phone application.
Helps fix device "freezing" that may occur under certain conditions.
System Lockout improvement for increased security.
Support for the new Daylight Saving Time legislation (available previously as a standalone update).
Provides better support for networks unique to some Caribbean, Latin American, and Asian countries.
Updates Cingular branding, replacing it with the new AT&T branding.
You can update your Treo 680 using the USB cable and a Windows XP computer. Mac OSX users and Vista users will need to copy the update to an SD card and run the updater from the card. As with all ROM updates, this will wipe out your personal data, so do a Hotsync first. If you use BlackBerry Connect or Good Mobile Messaging, you'll need to re-install that software after the ROM update is complete.
This will update your ROM to version Treo680-1.09-ATT. Check your ROM version by going to Phone Info. If you already have this version, you don't need to run the updater.
Get the ROM update for the Cingular/AT&T Treo 680 here: