Weekend Projects' PDFcast includes Kirk Von Rohr's article about screenprinting that was published in Craft: Volume 1.
After Bre drew design, Matt scanned it into a photo-editing program and increased the contrast and played with the levels to make the black all black. Then he printed it out on a transparency, prepped and burnt the screen and we screen-printed it on everything we could get our hands on!
Download the PDF to read the article and get all the details and a supply lists and you'll be ready to print your own t-shirts in no time! - Link.
Make: Video Podcast: Learn to Screen-Print Your Own T-Shirts - Link.
Update: Kirk will be demoing this at Maker Faire! - Link
