Just remembered about another problem I'm having with the HTC Droid Eris. This was happening both before and after the update.
Occasionally, while I'm operating the phone, it will move selections around, scrolling a webpage by itself, jumping to the various clickable elements, while all I'm doing is holding the phone without touching the screen or any buttons/scroll wheel. It's pretty spooky, but more annoying than anything else.
Anyone else seen this?