I think N00baris admitted being Numan about a year or so ago(He certainly had the same tactics as Numan, that's for sure).
Funny thing is, he made of 20+ socks in the span of 3 years(No joke, Gideon, Lightsnake and the others can vouch for me).
I think he set a record for 'the most socks ever created on an internet forum'.
I know Sorgo made a sock around '06, and Ush caught him pretty easily.
As for katarn, ironically, he was one of the few who didn't make another sock when he was banned(Atleast, as far as I know of, he didn't).