T-Shirts, Mugs, and Mouse Pads...Oh My?

Okay, it's unlikely you'd get rich off of this, but I'd still like to know what others think.

I ran across this website http://www.cafepress.com while looking for something totally unrelated (isn't that always the way of it?). It says that you get an "online store" with them for free, but it works more like an affiliate program. The unique thing is that you really put your own spin on the products. You upload you original artwork which they will then put on the products such as t-shirts and mugs.

One possible use for this is to create and sell stuff that compliments your existing business/website. For example, the logo for Seeds of Wisdom could be put on mugs and mousepads and then sold from this site. :)

Others are just trying to create just stores with only their designs and these products. From reading the message boards at this site I get the impression that most aren't making any money. But I also got the impression that most of them don't know anything about marketing or internet marketing either.

I guess I'm seeing this as kind of a challenge. I can understand how you can make money selling info products and such on the net. But when it comes to products like clothing and other tangible goods I wonder how it could be made at least somewhat successful.