I have been having this issue since the upgrade to 1.1.1.

I open Safari and I see a blank screen and URL bar. The screen and none of the buttons respond. If I wait the phone will reset itself, but that doesnt fix the problem.
I have ti go into var/root/library/Safari and delete Bookmarks.plist.

That option works for a a day or two and then it starts up again. I have try reseting the enitre phone as well and doing a fresh install of 1.1.1 anyone have any ideas?