This thread started in June, 2010, long before iOS5 was released so whatever is causing Safari to crash now may or may not even be related.
So far, we don't know much:
Most of this Safari crashing occurs on iPad first generation units, not so much if at all on iPad2s.
Other browsers may work with more stability than Safari. Might not.
Seems to have started for most of us after upgrading to iOS5.
Turning off Java might help. Might not.
Doing a complete DFU does not cure this issue although it might temporarily make it go away..
Personally, this crashing of Safari bugs me but my use of my old iPad is not critical so, unlike some of us, I'm not really all that bothered by it. I hope there is a solution for us, though Apple may or may not ever get around to addressing this in the iOS for older hardware. I have no faith at all in Apple's willingness to assign resources to obsolete products. Much better for Apple if we all bought new iPads.