Personal Shopper

One of the best shopping sites I've seen come along in a long time, Personal Shopper dynamically updates based on your product preferences. You can open the Personal Boutique page and it will simply refresh with new product recommendations every few minutes. Add friends and family with their respective interests and preferences to receive gift reminders and recommendations in time for birthdays, anniversaries, and holidays.
This is one of the few times I'll recommend a shopping site without my being an affiliate ;)
Check them out: http://www.personalshopper.com/