Discuss the fun task of marketing a t-shirt shop. Where to advertise, local marketing tips, word of mouth, press releases, search engine marketing, keyword advertising, magazines, etc.
I don't think it's just that simple. You don't want to create a linkfarm and you may not want to trade links with direct competitors.
Either way, let's keep the link exchange requests "off board". If you find someone that you'd like to link to or exchange links with, you can contact them directly via PM.