Marval - 10:45 pm on May 9, 2005 (gmt 0)
Here is a link to an overview of the act - which implements the WIPO treaties for the US - (hopefully the mods will let this one fly)
If you read it closely, there is a section on the responsibilities of a search engine linking to infringing sites that includes a bit about financial gain for the SE (should be something you look into)
Understand that the DMCA only applies to US sites - other nations have similar laws under the WIPO treaties and the first and most important clause that will draw your attention is that to pursue actions (especially beyond a standard DMCA notice to the ISP) you will have to have your work actually registered with the Copyright Office.
I have been sucessful with a DMCA on one site I own where I was dealing with theft of the original content (the whole site was copied and place on another domain) but have seen Google backing off from scrapers and the like as it seems they consider that a different beast?