Since updating to 5.1.1 I've not had any crashes on safari on iPad like I was getting, especially when replying on here.
I have noticed though, that tabs used to stay populated with the page, I.e. when you changed between tabs it wouldn't reload the page like it used to a year ago, I preferred it eh en they changed it to not refresh the page when moving between tabs, but it would seem that maybe there wasn't enough memory to do this, that's why we started seeing issues, so they have gone back to the old way of refreshing, it's not everytime, much be after so long. Seems more stable, but sometimes it's a pain it reloading when I might want to see what that page already had on it.