My Glo is in a Neoskin kindle case that rwhe recommended in the 'How to make a sleep cover' sticky thread.
I admit that I bought this particular case because I liked the
owl design but I have been nicely surprised by how protected it keeps my Glo.
The case is a zip- around, which means the sides are protected and the noprane material protects from bumps. The part that goes on the screen is toughened-- it's harder than the part that covers the back, so it gives more protection from head on knocks. More comments on its toughness in the reviews on the linked Amazon page.
Now I'm not saying it would protect if I were to whack the screen -- I'm not about to try. But It's kept my Glo spotless so far. I am much more confident with it than with my old official kindle3 cover, and I like carrying my Glo with me in a way I couldn't with my Kindle.
It regularly travels most places with me in my handbag, and hasn't fallen afoul of hairspray cans, packets of mints, hairbrushes, keys or phone. It's been all round Wales and up snowdonia in my handbag, regularly survives a two hour train journey being bumped by passengers, bumped into tight spaces. Every day knocks seem no problem.
It even got rolled on once by my boyfriend with no ill effects (have never forgotten to replace it on the bedside table since).