chrome on windows laptop, iphone and ipad. Only ever use one other and thats firefox for when i am playing WGC online due to better handling of flash player.
Mostly IE until a few months ago......mainly because I used the internet from pretty much the start of dial-up when there was very little choice and have always been confined to IE at work until very recently. Could never be bothered changing to Firefox. Have started using Chrome due to still being XP (ancient IE) at home and some pages simply won't work (GM forum being one of them). It's OK, so is Firefox and all the others. They all seem to display web pages quite effectively so I'd use any to be honest.