not too long ago, when i went to a review website, one of the ads tried to execute a malformed java, inturn to run a exe file threw safari. Well the exe file terminated as I have execution disable bit enabled on my athlon 64bit/Vista 64bit.
I reported the virus to microsoft. And it was one they never sae yet.
So I say, safari has their proplems. Also upgrading to the latest version of safari, bricks your itunes/safari, so it can't access the internet. THe new safari uses multiple threads to download from the internet and render pages, well that engine has bugs and wont work on all computers, so I had to downgrade my safari.
I am just thankful for execution disable bit.