I experience all of the issues you have stated in the first post.
Missing calls because the screen does not respond and need to call back - almost everyday
unresponsive browser - everyday
music stars playing after a phone-call ends or is missed - very frequently

I just hope that PR1.2 will solve most of those problems soon

(I have overclocked to 900mhz btw)

Ps
Right now I cannot unlock my n900 -.- (it also happens)