Try:
http://www.cainer.com
(Horoscope site that my missus likes... I don't go there!)
3g on 3.1.2 = OK
3GS on iOS 4.01 = Crashes every time once the site has fully loaded (site above) (keeps loading after the blue status bar 'finishes')
4 on iOS 4.01 = Crashes every time once the site has fully loaded (site above) (keeps loading after the blue status bar 'finishes').
I also (on the 4) have 'freezes' when browsing with 3+ tabs loading pages at the same time when you try and switch tabs it simply freezes. I have to hit home and go back into safari and it has recovered... Irritating. I have restored twice and it's now jailbroken, but I had the issue before jailbreaking!