We're planning to be going with Pajamas Media for our advertising when that starts up, likely around October 1.
Until then, though, we're trying out Henry Copeland's BlogAds, about which I've heard many great things. So if you've wanted to advertise on the Conspiracy (185,000 page views per week, according to SiteMeter), the next few weeks are your big chance. We'll also be part of Jeralyn Merritt's lawyer blogads mininetwork.
In the meantime, many thanks to Box.net, our new temporary sponsor!