Compbits is an Octopress theme used at my blog. It was inspired by the design of simplebits.com, thus the name 'compbits'.
$ cd /path/to/your/octopress
$ git clone http://github.com/iwinux/compbits .themes/compbits
$ rake install['compbits'] # in zsh, try rake install\['compbits'\]
$ rake generate