We have a tag for spin glasses, but not a tag for glasses. I find this to be pretty absurd.
I recently proposed the tag amorphous-solids, but I'm wondering wether it could be useful to create the tag glasses (or glass) since someone asking a question about glasses will probably try to type "glass" instead of "amorphous".
Also, it could be useful to create a quasicrystals tag.
Since the response has been mainly positive (or no one seriously objected, anyway...) I will create the glass tag. As for the quasicrystals tag, I still haven't decided what to do.