Update: See part 2 of my battery life saga here.
Yesterday my phone's battery life suddenly dropped from about 30 standby hours to about 4 standby hours.
According to the nifty meter that tracks what is using battery life (how do they do that!?!?!?), the display was using 60% of it - even though it was locked the entire time. Reducing the screen brightness was ineffective. It just kept draining and draining. Today, the phone made it to about 3pm and was at 18%. This time it said WiFi was the culprit, despite not being in a WiFi area and not using the phone at all (up until the point that I noticed the battery issue). I tried stopping applications, disabling WiFi and BlueTooth, but no good
I installed Fring about 3 days ago, and have not used it. The phone claimed that Fring used 3% so that isn't the culprit either. Assuming I trust the meter which I no longer do.
Lots of people have complained about battery life isssues, so this begins my search for the cause. First two step: uninstall Fring, reboot the phone. I'll update this entry as the experiment begins...