Read/Write Web has a great article on the different Social shopping sites out there today.
The most notable portion of the article is the conclusion:
"Most notably, there is still big room for innovation in this market. Kaboodle has nailed the basic feature set, but much more can be done based on the power of masses and technologies like RSS. We expect to see many more innovations in 2007, such as personalized recommendations, product alerts and interactive chats based on where you are shopping."