w3m in emacs, mostly -- except for a few sites I care about (like HN) that absolutely insist on using Javascript.

It might be a bit extreme for most people, but browsing the web in text-only mode (w3m is capable of displaying images, but I mostly don't use it that way) is great!

I quickly and efficiently get what matters to me most: the content. And I don't have to worry Javascript, Flash, HTML 5, or other rich media vulnerabilities.

Not to mention the great integration of w3m in emacs, which is far beyond anything you'd get with a standalone browser (even if you're using addons like Pentadactyl or It's All Text).