I know heat has been discussed a lot, but I am experiencing my phone getting hot in my pocket when nothing is happening.  The only thing I can think of is that there are live wallpapers running, and thus, making the processor work.  Do live wallpapers alone cause heat for anyone else?  I have only noticed heat since my 2.1 update, as I didn't have heat issues before, even when web browsing, etc.  It always stayed fairly room temperature to the touch.