Added Qassia, Tutorial Tub, How to Do things.com, Xomba, Rankrz and Rate It All. Haven't done any site descriptions for them yet, although Qassia and Xomba look promising to me.
Both are sites that generate income through Google Adsense.
Qassia appears to be a cross between a promotion tool and an article publishing site.
Xomba appears to have quite positive feedback from what I gathered after searching the web about it.