Everytime I see these threads I can't help but wonder why people haven't thought to list
http://www.bitcoinmagazine.net. We have over 20,000+ active readers for online and 3,000+ for print, are distributed in Barnes & Noble (starting Sept.2012) and have a focused readership where people actually -read- the ads from both inside
and outside the Bitcoin community.
I'm looking to publish ads on my own site, though, not run ads elsewhere; at least for the time being. If I develop anything worth running ads for, I'll keep that in mind.