I use the Steam a Seam lite too, though I still think it adds too much stiffness to the final applique. Even using the windowing technique. I'm trying Misty Fuse next as I've heard wonderful things about it. It's much more expensive though:< and only found at LQS online
http://www.Mistyfuse.com/ also I'm going to give softfuse a try
http://www.shadestextiles.com/produc.../softfuse.html
Both of these products are supposed to give a better feeling final product than Heat and Bond or Steam a Seam. But, the cost is something to consider!