Open Links is a Ubiquity plugin that allows you to open links on a page or normal URLs. That practically allows you to navigate the web without leaving your keyboard.
To use type 'open' (shortcut only 'o') followed by the name of any link on the page or a URL.
The source is available here openlinks.js.
First example illustrates navigation through a page. Matching is case-insensitive and 5 links are displayed as a suggestion.
You can alternatively start typing a URL and the plugin will lead you there.
Check out more Ubiquity plugins.