Realistically, I don't do enough with my Ham Radio license. But it makes a good short IRC/Twitter handle and gives you a decidedly nerd-cred license plate for your car.
The significance of "AVG" in the vanity name? At one point I was going as "Average" on some message boards. But, you could read the typically-slashed zero in the license as a "naught" or the universal "not" symbol. This leaves the callsign wonderfully ambiguous.