Forgive the double post, Spreadshirt extended the time to switch to the New Template until May 10th.
This is good since I know little about XHTML which is the new format. The new CSS template is huge- a lot of new stuff in there.
Here's the
New Template thread on the Spreadshirt forum. It's causing some confusion, but Spreadshirt is doing a good job of responding to questions and fixing problems in the new code.