Firefox 1.0.7 + Prefbar 3.2.1 + Pornzilla -- beyond Firefox's inherent capabilities it's so easy to turn on/off Animation, Flash, Javascript, Referrer, etc... with Prefbar and Pornzilla has so many tools to remove redirects, download files, etc... A far more safer and more efficient porn surfing experience than any other (although Opera can be good as well).
I'm testing Firefox 1.5 + Prefbar 3.3 Beta now and will switch to it soon.