Top stuff, but then I do have a liking for projects that prove things can be done regardless of practicality of the result.
Such projects can be met with derision ( I'm not accusing dave j of that ! ) because it's ultimately impractical, but that's usually to miss the point; that "impossible" often isn't actually true, it's the foundation for further effort which could be more practical, and those doing the project usually achieve a lot more than just the headline result.
If it weren't for people thinking "I wonder if I could..." the world would be a much duller and probably more backward place. I see the R-Pi computer as fitting perfectly for facilitating those who are willing to try things and explore possibilities.
Now who's going to be the first to write an R-Pi computer based AVR emulator to run The World's Slowest Linux Computer and give it 1080p video output