Haven't tried any of the links yet, but the Ragnar Benson Collection is a set of instructional howto's from building flamethrowers to landmines…
A nice collection (with previews) of a number of icon sets. Most look to be free too.
How to cache an element. If you replace 'first_use' in the 2nd example with the current user Id you can cache elements for individual users.
links for 2009-02-03
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