Have you tried rendering in a "room" so you can see your reflections, refractions and transparency? For me, these things define what makes glass look like glass. Or are you planning on making a pic in space or something like that and are working to get a glass texture in that type of environment? BTW, I feel like an idiot giving you advice, AS. I've seen your work. :^)

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy