I have one of those racks on one of my commuter bikes. I got it from nashbar for $10.
I haven't actually put anything on it yet. I wouldn't plan on putting a lot of weight on it.
I was going to put some velcro tabs on a small camera-type bag and use it as a front rack trunk (instead of a handlebar bag) for easy access to small items.
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Gunnar Sport
Specialized Ruby
Salsa Vaya Ti
Novara Randonee x2
Motobecane Fantom CXX
Jamis Dakar XCR