(Updated 28 February 2016)
Here's my list of anti-bootleg resources:
General guides:
The Pirate Anime FAQ: A Guide To Unlicensed Anime and Manga Related Goods-Otaku News
Bootlegs-Anime-Wiki.org
Bootleg FAQ-JazzMess.com (via the Wayback Machine)
Anime Corner Frequently Asked Questions: "5. Are the products on the Anime Corner Store site bootlegs or the real thing?"-Robert's Anime Corner Store bootleg mini-FAQ (especially useful for CDs)
Bootleg FAQs-Australian Anime Shopping Guide (via the Wayback Machine)
On CDs:
Chudah's Corner - Reference: Bootleg {CD} Info (via the Wayback Machine)
ANIMEfringe Cover Story: "Made in Taiwan: Son May CDs versus Original Japanese CDs" (via the Wayback Machine)
On plushies:
Buying Authentic Japanese UFO Catcher Plush on eBay-an eBay buying guide
Bootleg Plush Toys Gallery Update May 14-UFO BBS4 (via the Wayback Machine)
On action figures:
Guide to Anime PVC figures on Ebay-An eBay UK blog (via the Wayback Machine)
"Anatomy of a Bootleg 101"-[Zero-Type] Forums thread
Counterfeit & Bootleg Anime Figures: How to Tell Fakes From the Genuine Licensed Products-Nuts for Anime Figures (via the Wayback Machine)
Discussion:
Anime Fans Against Bootlegs-Facebook
Knockoffs & Bootlegs-a photo blog on the topic
Spotting Bootlegs-A long Anime News Network thread
Information (on what has been licensed):
U.S. Anime Release Dates / Unreleased License / Forum Resource Links Thread, The Fandom Post
Anime License List (1997-2011)-Mania.com/Anime on DVD (via the Wayback Machine)
Ledoux, Trish, and Doug Ranney. Fred Patten, ed. (1997). The Complete Anime Guide: Japanese Animation Film Directory & Resource Guide, 2nd Edition. Issaquah, Wash: Tiger Mountain Press. ISBN 9780964954250. WorldCat. Chapter Three "Video Directory" lists all anime home video titles available in America 1 January 2005 through 1 January 2007.
AnimeMania-Anime and Manga Commercially Available In English [in North America] (through November 2006)