Infamous for their video game You Don't Know Jack, this company has made it through multiple lives. They build games, demos, and other 'interfaces' based a playful dialogue with the user. Hard to explain, easy to get once you see it. Check out this demo for SurePayroll - you'll have to scroll down.
If you're tasked with explaining a complex thing online (a great financial service tool, a CRM application), you should skip past the fantasy that people want to see another lazy bunch of screenshots stitched together with ppt slides. This approach can actually bring the idea behind your product to life. Harry Gottlieb founded the company in 1989 and continues to find himself at the helm.
Dimensions: 23 people x 17 years x $ NDA
Funding: Founder
Customers: Anyone who has to explain what they do via the Internet
Location: Chicago [Lincoln Park] + www.jellyvision.com