[flxy]

.gg has seen decent adoption in newer gaming related sites. But that's the only one I can think of right now.

[dingaling]

Not only is .gg expensive but phonetically awkward on the telephone, something I didn't consider when registering my main domain years ago.

[philpem]

Every time I see a ".gg" domain, I read it out as "gee-gee" -- a colloquial term for a horse...