The recently released ‘Monospace’ variant of the Ubuntu Font Family has been set as the default monospace font in Ubuntu 11.10.á
Ubuntu Mono (not to be confused with other, more contentious mono’s) is set at a legible 13 pixels.
OMG! Reader! Warrioring64 has put together a video of the font in use, so if you’reácuriousá- take a peek!