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anallawalla - 1:45 am on Sep 12, 2004 (gmt 0)
Get him out of the SERPs and that will hurt him more than the solicitor letters, which he can ignore for a little while and try and get some revenue in the meantime. Google (organic) acts very quickly. AdSense may ignore your complaint other than sending a form reply, as was my experience last year. Their rules are tighter now, so who knows.
The main advantage of DMCA is that the main SEs are US based. If your copyright text appears in any SERP, the SE will act on your complaint.