I got the following from someone claiming to be Mr. Anonymous. It was a different address than normal, but what I fact-checked of the list seems to check out...so I'm running it anyway, in light of all the hub-bub that started recently around TCJ's tweaking of their web-strategy. Mr. A, if this isn't your stuff, my apologies...but it's worth displaying, regardless.
I compiled these on Quantcast. Post them if you want.
CBR 303,000 US
Newsarama 269,000 US
However, Newsarama led the month before; trending, they switch places about every other month.
At 183,000 US, Ain’t It Cool is still almost 100,000 US BELOW Newsarama in total readers; they don’t have a comics subdomain.
Now, the other "big name" sites and subdomains:
ComicsAlliance.com 86,000 US (benefiting from being part of AOL)
Blog@Newsarama 76,000 US (113,000 world)
Comics.ign.com 49,000 U.S.
Robot 6.comicbookresources.com 47,000 US (71,200 world. Yes, Blog@ has a higher U.S. than Robot 6's world.)
WizardUniverse.com 46,300 US
Comixology 37,600 US
The Beat 37,600 US
ComicsBulletin 33,600 US
Comicmix 29,100 US
SplashPage.mtv.com 26,400 US
Major Spoilers 19,000 US
ComicMonsters.com 18,700 US
ComicsContinuum 17,000 US
ComicsReporter 11,800 US
ComicRelated 11,600 US
Comicon.com (Pulse) 11,400 US
Broken Frontier 10,600 US
Comics Worth Reading 9,900 US
Bleeding Cool 8,800 US
4thLetter.net 6,000 US
SavageCritic.com 4,000 US
ComicNewsI.com 3,600 US
TCJ 3,400 US (Journalista doesn't chart as a subdomain)
Factual Opinion 2,700 US
Later,