Google Chrome and Firefox sometimes. I use Firefox for streaming games it just seems to work better. Where as chrome every other time. Internet Explorer is just the worst, its slow, has too many toolbars and just isnt as easy to use all the feature properly.
I didn't realise that was still going - I used to use Lynx back in the days of dial up.
Anyway, this really should be a multiple choice poll as most people probably use more than one. I use Firefox and IE at work, Safari on my iThings, Opera on my mobile and Konqueror on my PC.