The MyGamer Store looks great !
I think MG apparel would go great, I'd buy a MG t-shirt in a heartbeat...
We've got a clan online store, we sell t-shirts, sweatshirts, hats, BBQ Aprons, clocks, teddy bears, stickers and buttons... Beleive it or not, the top selling item is the OP3 Classic Thong, very wierd thing... And no I'm not wearing one at the moment...
Stan, I hate to post a commercial site link, but
http://www.cafepress.com/ has been a great storefront for our clan, there is no up-front cost, you can set the profit margin (0 to 100% markup) for each item, and they mail a profit check one a month...
You could even have a contest for the best designed logo for a t-shirt and then sell it on the storefront...
Just some ideas...
Peace,