Verizon replaced my phone. I got a brand new phone and new battery. Amazingly this phone's battery is about 2x to 3x better then my first. I installed all the same apps I had before, except battery widgets. I can go easily 24+ hours on a single charge with my normal usage patterns. I have everything on! Including Enable always on mobile network, google syncing, etc. I also have GPS on 24/7, which I think Maps uses when it needs to. The only problem I have run into is the Youtube can't play video. Other then that it feels like a different phone. I have received both updates.
Ironically, the Verizon tech recommended I use Advanced Task Killer! I know there is a lot of talk about that. I do use it occasionally, but not sure it really helps.
My new Eris is running so well, not sure I even want 2.1 at the moment!!