How about Java? (Score 2, Interesting)

It isn't quite the same as running Linux, but we have hacked a Roomba to run Java. We desoldered the micro on the Roomba board and hooked it up to a Javelin Stamp instead.

Pics here. It's kind of slow. Being slashdotted is not a good way to discover that your ISP does bandwidth limiting :-(.

Once the vacuuming brushes are removed the Roomba is much quieter and I am sure that battery life at least doubles. Chris.