Am using IE 5 at the moment (work), and would never use it at home unless I happen to be on a site which requires it. For me, its Opera every time for many reasons (the interface, the speed and the simple and un-justifyable reason of 'not' microsoft.) I did actually try Netscape for the 'not Microsoft' reason and found that it appeared to put spyware everywhere and while I am in many way not paranoid ebough to lose sleep about it, decided to splat it on principal. Not sure if current version does .
One thing, at home, I am using (i think). Opera 7.03. The email handling takes a bit of getting used to in that the way it handles folders, but when understood is fine. I did find that the import of contacts was a bit of a hit or miss affair as well