bendee - 4:48 pm on Sep 28, 2004 (gmt 0)
I believe the sept 23-24 is targeted specifically at amazon store sites. As far as filters go its pretty easy to implement if you search for "script by mr rat" on all the pages, or if the directory structure is based around ASIN #s.
I'm sure other datafeed based sites will folllow. I've heard its not just one-man-band sites starting to get hit. Companies like bizrate.com and overstock.com are also facing major duplicate content filter issues, and have been advertising for in-house SEOs to help them with the duplicate issues. Since they provide feeds to a lot of other major sites it is going to be a big issue this christmas.