http://www.schoolofpodcasting.com/youtube
Today I explain how promoting your podcast with t-shirts is a great way to get your name out there, but on demand t-shirts can be expensive.
Here are links to the sites mentioned:
(in some cases affiliate links)
http://schoolofpodcasting.com/shirtcity
http://schoolofpodcasting.com/shirtmagic
http://schoolofpodcasting.com/cafepress