re: Are there any legitimate businesses which use the ".biz" domain?
My impression is that .com is still the "brass ring," despite the higher prices of some of the others, notably .tv.
I've got a .biz that I never use, and a .info that I've got a little bit of stuff on**. Bought 'em 'cause they were cheap (not unlike me, apparently).
**Ok, ok, stop pestering!! I was gonna keep this under wraps a bit longer because there's not much there, but here it is anyway:
IntoTheCosmos