The article quotes an AOL spokesperson:
"The goal is to allow mobile users to browse conventional HTML Web pages, enter specific URLs and access the AOL Search, Pinpoint Shopping and AOL Yellow Pages offerings just as they would from the desktop to easily find whatever they may need."
I was told earlier today that the beta was only open to AOL subscribers on the Sprint network. However, a few minutes ago I was able to access the beta site on the open web with my Treo 650. The beta currently allows you to search the web (Google results), yellow pages, and a mobile web version of AOL's Pinpoint Shopping site.
Postscript: AOL tells me that access is only available for certain mobile devices and from certain carriers.