Professor Lawrence Lessig's book "Remix" is reviewed in The Miami Herald together with "Public Domain" by James Boyle:

Remix: Making Art and Commerce Thrive in the Hybrid Economy. Lawrence Lessig. Penguin. 327 pages.

Lessig's earlier Free Culture is still free online, and this new book is promised to be made similarly available. Here, the professor (Stanford Law) echoes similar themes but gets a bit more into the economic implications of loosening the restrictive reins of copyright.

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Lessig and Boyle are strong and reasonable advocates. Fortunately they're also engaging wordsmiths, too.