[jasonkester]

Revenue-generating projects have the advantage of not only impressing potential employers, but also generating revenue, potentially making "employers" optional and letting you move to Switzerland for six months because it's ski season.

Open Source projects may impress potential employers, but beyond that the best you can hope for is extra credibility from people who smell vaguely like soup.

I think I may have tipped my hand as to which one I'd spend my time building, given the chance.