Conkeror is a web browser which is extremely keyboard friendly. The default keyboard shortcuts are created to be familiar to Emacs users.
To install Conkeror on Ubuntu 11.10 you first need to clone the repo:
git clone git://repo.or.cz/conkeror.git
To launch the application you then need to run the command:
firefox -app /path/to/conkeror/application.ini
The application.ini file lives in the root directory of your repository.
Since the application is not installed in the usual way there is no Unity launcher entry for it. For info on how to create one read this post.