Used to use IE because I was too lazy to change it, then switched to Chrome when the DL link popped up.
It's really nice to use I think; it doesn't clog up with all that shit you get on IE every 5 seconds, looks good (better than Firefox IMO, and yes, of course appearance matters), runs really fast and the icon is strangely sexy (in a non-sexual way). Plus, if it does happen to crash then it takes all of 2 seconds to exit and restore all the pages you were on.
Everyone goes on about Firefox like it's the be all and end all, but... Meh, never tried it and can't be arsed to. Browser's aren't exactly interesting but Chrome works great for me.