I believe I've seen Darth Bowser, MarioFreak, and Bowser314 either in their original screennames or modified ones (or maybe just people with similar names); as far as the rest, they only illicit fond memories (really, it's been such a long time since I saw all of those names together). Some of them may still be around in the form of a screenname that I don't recognize (I'm sure you remember
SSacobie), but for the most part they're gone (maybe to
somewhere else?).
Well, that's not exactly true; some post like, once in a blue moon, and there are 'rumours on the internets' that they still lurk around here.
And as for the old forums, well, they're kinda scattered all over the place or gone. The
Battlefield is still here (in fact, apparently
Wyborn posts there), the
Zelda forum is still here, the depreciated
OG Board is still here... Pretty much everything is grouped
as you see it here, it's just that the forum mods mess around with the forum names/attributes because they're bored or something ^.^() Nintendoland lost their affiliation, so they're grouped under NGF (Nintendo Gamers First), but SMBHQ still has their forums.