I've always threatened to do this... and now I have
For the last couple of years I've been directing people to an ancient post on TonyRocks' blog where he wrote a tutorial (with my help) on how to put eBay auctions on your WP blog. At least a handful of DP members have gone on to develop their own successful custom scripts using this method (myself included), but it seems there are still plenty of people having trouble setting up their own script.... so I've gone ahead and made a free one, and written a little tutorial on how to get it working.
It's nothing spectacular, and is more a 'stepping stone' for people to write their own custom scripts (I use a heavily modified version on my own sites). But, out of the box, it should hopefully work for most people.
I've tested it using Wordpress 2.3.3 (the latest version), and there doesn't seem be any probs. But I'm sure there will be - so if anyone tries it out and can't get it working, let's hear about it. If there's enough (or any) interest, I might consider adding more and more features...