Hi all,
I'm from OpenX, an open source ad server for PHP.
The upcoming 2.6 release includes a new developer API which lets you control users & banner inventory, grab statistics, and generate invocation tags.
One community user has started a class in Ruby for working with the OpenX API: github.com/aaronp/openx/tree/master
I'm sure he wouldn't mind some help or testers, and hopefully its a useful addition to the Ruby community.
Cheers, Arlen Coupland