A few days ago, I noticed the iPhone started to lose power astonishingly fast. After checking out Apple's page on conserving battery power I reset the phone to factory settings, shut off Push, and set all "Fetch New Data" to Hourly.

Memory Info, a handy little app which shows what processes are active, along with precise battery power levels showed that that MobileMusicPlayer (iPod) was active even though nothing was playing, so at first I thought that might be the culprit.

However after systematically removing each application that wasn't absolutely critical, it turned out that Twitterific was the real cause. Perhaps I had it set up wrong, but I'd rather live without Twitter than without my iPhone, so it has been deleted. It's a battery hog!