My focus will get warm when I'm doing some data intense stuff, ie downloading a bunch of music from Zune while continuing to use the phone for other things, but nothing that concerns me. My last phone was a palm pre plus, that thing could get crazy hot, but with the homebrew overclocks in place, I always knew that it wasn't at a dangerous level. If it's burning your hand, you might have a problem...outside of that, you should be ok.