Vimperator is great. It’s a Firefox 3 add-on that implements a separate input layer above normal Firefox controls so that you can navigate around all the browsing and browser settings with vim-like keybindings.
A coworker turned me onto the thing, and I’ve found it makes working in a browser much more productive, as I’m not always alternating between the keyboard and mouse to navigate between different input focuses.
It keeps my hands where they belong when using the computer — on the keyboard!
One feature I like in particular is a binding for ‘[[' and ']]’. The bindings in their respective directions will search for anchor (<a … >) tags on the page and do a little regexp in the inside HTML for ‘prev’ and ‘next’.
This is mucho awesome on sites like Flickr, or multi-page articles where you can just double-tap the brackets either forward to backward to flip to the next or previous page.