Business idea of the day -- FocusGroup software to let web site owners and designers run ongoing focus-group-style polls on their sites.
Every tenth (or nth) visitor would get a popup window or something -- maybe something like an interstitial page, that invites them to join the focus group. It would have to be branded right, so it didn't look like an ad or fake thing. But then all the visitors who accept could be redirected to a chat room with a moderator who runs the focus group.
Or maybe it could just be a pre-determined set of questions they are presented with.
This technology already exists, but I'm not aware of anyone positioning it and using it specifically for site design. It could also be adapted for advertising or packaging reviews.
One player in this space: goodmind.net, offering "online focus groups" and a site that looks like it could use this service.