We\'re using OpenX to serve ads on a number of sites. If the OpenX server has problems, however, it blocks page loads on these sites. I\'d rather have the sites fail gracefully,
OpenX has some documentation on how to make their tags load asynchronously: http://docs.openx.com/ad_server/adtagguide_synchjs_implementing_async.html
I've tested it, and it works well in current Chrome/Firefox.
It takes some manual tweaking of their ad code. Their example of how the ad tags should end up:
Some content here.
Ad goes here.
Some other content here.