In WordPress it's easy, you just upload your plugin and vah lah instant online store. I even have a WP blog that gives away free stuff right in my blog, but for the life of me I can't figure out how to do it in Blogger.com
I know you can create a PayPal button for each and every item, but that would take a life time. Within WP I create an item to sell (or give away) within a post. It's very simple.
(PS, this is a page from my WP blog so you get an idea of what I'm looking for. But honestly I'd be interested in just about anything at this point: http://stuckathomemom.com/freestuff/?p=308)