i just shopping trolley things until i can buy them

I think a wishlist is a brilliant idea. Great for peeps buying you presents as well!

I asked Threadless about a wishlist recently and got this response from Brianne "We thought about including a wishlist with the Threadless redesign, but decided against it. The Threadless stock is very dynamic and ever-changing, so a wishlist would not be very helpful. You might save a shirt in your wishlist, but when you go to buy it in the future, the shirt might not be in stock. That is why we are sticking with reprint requests. It lets you know when a shirt you like is available again and lets us know how many people want the design. Then when the shirt is available again, you can make the decision to buy or not." Brianne also said, like @penkethman_sophie above, that "Many people also use their user accounts as a wishlist or a place to keep track of shirts they wish to buy."
What I was actually thinking of, more than a wishlist, was a favourites list. I just love looking through all the Threadless designs, some are beautiful, some are very funny, its kind of like reading a comic strip. Because there are more nice T-shirts than I could ever afford to buy, I would like to be able to 'bookmark' designs just to revisit again.
@donnamatrix - I guess we could be using the 'email to a friend' not to suggest that your friend might like it, but to suggest they might like to buy it for you! Cheeky :)