I second the recommendation for Swisher's videos. I like them better then Mel's, although I know that a lot of people will probably feel otherwise.
I feel Swisher illustrates how to cast better, and explains the details of casting really well.
I don't have Jason Borgers book, but I have been very impressed by his writing, however. He is very good at explaining things.
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cheers,
markg
[This message has been edited by markgraumlich (edited 13 December 2005).]