Indeed, this is the biggest annoyance with my iphone (well bar no copy/paste 😉 ). UK 1.1.2 no hacks, no jailbreak - hardly any storage used, no other pages open or apps running (lke the ipod) - Safari still crashes on average twice an hour depending on the websites. I actually have reduced my surfing on it because it is so annoying.
Sure re-opening Safari take sme back to the page usually, but it takes valuable time and just irritates. I've tried restore, I've tried cold reboots and though it does get slightly more stable for a while it still crashes.
I'm sure 1.1.3 (or whatever the next update is) will sort it out because it seems to be a well publicised and known bug - I'm not the only one I know with these issues, this makes 3 out of 3 iphone owners I know with this issue in their handset.