Just wanted to make a little list of places I do this (though I didn't do all of this today, of course). Of course.
MySpace: the majority of our non-writer traffic (i.e. not Duotrope and not Ralan's) has come from here
Yuwie: a MySpace clone that promises to share ad revenues. Worth a shot, right? And if you sign up with that code in that link there, GUD gets extra kudos of some sort, somehow.
FaceBook: a friend told me this was worth trying, and that the connections, while less spammable, are stronger, and more interactive--and as such would be more likely to actually check GUD out.
Gather: another social site that offers rewards for using it. And this link has a reward built in--$20 borders gift certificate if 5 people sign up through it. That'd be a lovely random prize for GUD to regift, wouldn't it? Here I mainly repost GUD's reviews and raffles.
It's been suggested I use LinkedIn for GUD promotion as well, but I don't get it well enough. And I did a little promotion on deviantart, but that didn't seem to really hook as well as I would have liked. And I've promoted on a number of LJ communities, of course, of course.
And of course, this doesn't count the myriad writing sites/forums/etc. Scrawl, Zoetrope, crittersbar (versus critters), backspace, absolutewrite, and many, many more...
Out of all of the above, if you were bored and wanted to create accounts on yuwie and gather through those links, that would be kind of spiff. Or it could be, at least. :) And I'm open to suggestions, of course, though I need to cut back at the same time.