I'm back! Let's go...
Standard Attrition - Big-time Marvel guy Jason Aaron has a Blogspot site (though not updated so much) and is active on Twitter, among others.
Comics on Comics - moved over to Facebook with Soundcloud and YouTube channels as well. Multi-media-tasking!
GutterGeek 2.0 - Formerly a Comics Journal blog, Jared Gardner can be found primarily on Twitter, and does have a (rarely updated) site.
Noetic Concordance - Once upon a time, Vaklam (Brian Cooksey?) ran this and six other blogs. All dormant since 2010. I think that's him on Twitter...
CONSPIRE! - Cartoonist Conspiracy is still posting consistently since 2005. Good for them!
Society For The Advancement of Dave - Dave is no longer being advanced by society.
Steve Rude's MySpace Blog - The Dude has his own page & blog here. (Man, I loved Nexus!) If you see a MySpace blog pop up here, assume oblivion. MySpace seems to be devoted to music primarily now. I never used or visited MySpace at any time ever, so I really don't know the utility or the history of the platform.
LEAGUE OF MELBOTIS - So League of Melbotis became just Melbotis, which led to Signal Watch. And Signal Watch is still going! Ryan Stearns is keeping the flame alive by posting nearly every day. Support this guy.
Comic Book Issues - Amanda posted for a couple years, and then quit the gig in 2012.
Masked Mayhem - It just kinda ran outta gas in November, I guess.
(* Permanote: I'm using Comicblogupdates and Update-A-Tron to facilitate this project. Quite a few of the links on these two sites rely on RSS/feeds. Some sites are still there; the provided link is just defunct)