For that Cardstar app that's already been mentioned - you need to play with the "Symbology" advanced option until the barcode matches your card. This appears to solve some of the reasons why it's not working for some. Interesting that U of C library is already in there too.
Anyone play around with Layar? Seems like its a bit of a work in progress, but it's pretty cool. It's essentially a virtual map/search tool projected over top of what your camera sees. I think it only works for 3Gs because it requires the compass.
For the cooks amongst us, there is also Epicurious which is a great free recipe book and shopping list tool.
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