Thanks for the tip, Erik, I haven't seen that before. I wish I would have known about it sooner. I wrote a quick little Perl script to grab that data and turn it into an RSS feed:http://onfocus.com/circle_rss.pl.txt
You just need to find the purchase circle you want to syndicate, note the (approx.) 4 digit number in the URL, and run this script on the command line:
circle_rss.pl [circle ID]
You could even set this up as a nightly cron job to create an RSS feed on a server somewhere. Then you could add the URL of the produced file to your newsreader and you'd be up-to-date with that circle.
Brad, you can definitely get your Wish List as RSS. You just need to do a standard public AWS "WishListSearch" query with your Wish List ID, and then change the f= value to the Amazon RSS stylesheet. Email me if you want the details. I have no idea how you'd go about adding something to someone else's cart that is then sent to you...seems like there could be some security issues with that. (You can add items you're selling through Amazon Marketplace to someone's cart, though.)