Some new-ish members who have that showing up and have drawn my attention:
SFW
UniversalMartin
Slow yer Roll
bhunt7
jassman24
Big Red Viking
Not that all those accounts are causing problems. I just looked through a couple threads where there has been some doom-and-gloom and found those showing the odd IP address. And they aren't the only ones with the odd IP addresses - there are some long-time posters with those showing up as well.
But I'd say most of the above list tends to be on the negative side except for bhunt7 (I don't really remember one way or the other on that).
It just got me wondering if they are using something to mask their IP address to try to avoid being discovered as a former member. Maybe I'm just too paranoid.