My T-Shirts came in today. I have to say that they look pretty darn good (thank you Cafe Press).
The resolution isn't as good as the original image (which is to be expected when printing on fabric), and the red isn't as vibrant as I would have liked, but I'm going to call it a success.
Here's a picture of what it looks like on some poor unsuspecting model.
Here's an enlargement of the image.