Share 'Have you seen this Shopit application you can put on your page?'

I was looking at Applications which I have remissly never looked at before because I was trying to find where my RSS feed is (if anyone knows where please do let me know!) and I found that there are all sorts of these Applications you can add to your page including this one called Shopit which says it is a Store where you can sell your work on your page. I havn't tried it because I don't have a...