Thanks for all the possitive comments!!! I used a stabilizer that I bought at Walmart. My first T-shirt quilt I used more of an interfacing, so I had to press the t-shirts onto another piece of fabric ~ what a pain! This stabilizer was much easier to use. It was just a matter of pressing the stabilizer onto the back of the t-shirts, then trimming to size. One thing I will caution about though is the iron temperature: if your iron is too hot, it can melt/destroy the patterns on the t-shirts, and it can "undo the glue" on the stabilizer. So... as you are pressing your seams later, be careful!
I most definitely would NOT do a t-shirt quilt without stabilizing the fabric one way or another! The t-shirts are hard enough to deal with without worrying about all the extra stretch!
Bottom line is simple... if I can make T-shirt quilts, ANYONE can do it! :lol: