Unfortunately, Amazon has discontinued the ListLookup API! Amazon's RSS feed produces the 10 most recent items from a wishlist. You can get the rest by changing the page number. For example, if you had 50 items in your wishlist, you could generate 5 RSS feeds - one for each page of ten - then compile them at your site.
You can generate a wishlist for a Wordpress blog using a plugin called feedList. This generates a bulleted list of my Wishlist items.
Pipe Web Address: http://pipes.yahoo.com/interactivellama/9d73ba552398cb835e2cf1de47599ad7