I found this fascinating quote today:
You can place your widget everywhere! Social networks (in the text section), blogs, web sites, etc! This will get you noticed, but also, your tags for the items on this widget are being found, as well as, you Name! That is a key factor- if you have several shops, make sure you use the same name, the same introduction, etc. That will increase you in the search ranks!Mommy Tyme, Mishaps of Mommy, Oct 2009
You should read the whole article.