Livejournal (of course)
Flickr
brightkite
identi.ca (new)
ping.fm (new)
LinkedIn (this one is
myspace
plaxo pulse
xanga
Skype (both for work and for home - two different IDs)
Gizmo (not so much - but it shows promise)
AIM (almost not at all, but I do still have a screen name)
ICQ (again not very much - mostly because I don't like installing clients)
del.icio.us (kinda)
gmail (and how...)
iName (although I haven't really found a use for it yet)
LibraryThing
outside.in (still testing)
slide (haven't found a need for it yet)
So - my question is - What are you using that I'm not currently using, that you think I might be interested in using (or that you think I should be using)?