Hey,
I just wanted to let you know that Tribal Fusion (one of the largest premium ad networks out there..) didn't have async tags. My page load times were suffering on a site with 20M+ pageviews per month.
I used writecapture to load everything up async. Tried using writecapture2 but couldn't work it out.
I've released my rather simple implementation at:
Just some interesting stats, average page load time as per Google Webmaster's Tools was 8s. With writecapture this number has dropped to 5s. Over 30% increase! :)