Haven't had to repair any glass scratches yet, (need too), but you might check out some of the products offered here:
http://www.google.com/#hl=en&source=...526d12389e3c08
This one appears promising:
http://www.janvil.com/
Keep us posted on your selection and how it works. Hopefully someone else with some experience with a scratch removing product will chime in soon.