While hunting around Google looking for a pattern for the crocheted Cats Afghan I saw on eBay but didn't bid on, I found a page at About.com which listed a Cats Afghan pattern available at FreePatterns.com (http://www.freepatterns.com/). So, I got my free account and, sure enough, there it was! The Cats Afghan pattern!
If you want this pattern, it and lots of other crochet and other crafts patterns are FREE at http://www.freepatterns.com/.
Later, I discovered (via Google) that the PDF file of the Cats Afghan pattern can also be found at:
[July 26, 2006] Heather posted a comment on another entry that she found the Cats Afghan PDF at:
[December 2009] The link above is broken. I have not found another link. Sorry!
[January 2010] Found a new link for the Cats Afghan (PDF):