smart_design,
how far along is your inline text ad system? Where is your company based? Perhaps a URL in your profile would be good so that people interested here can preview your system or at least get some info.
Being able to set ad link CSS properties is a good one. That way the publisher can determine if they want the ad links to have double underlines, dotted underlines, high-lighted with a background color, and/or font settings. It would be nice if Google Adsense had that kind of control.
Ability to block certain advertisers and block certain keywords that trigger ads are important features.