Off the top of my head: Electronic Arts, Bigpoint (Using it on several titles, including Battle Star Galactica MMO and The Mummy MMO), LEGO, NASA, Cartoon Network, Warner Brothers, Disney, Marvel, etc, etc, etc.
Yes it is not a toy.
Tell your interested party that Unity being used by established and independent developers alike, not only to create great content, but to deploy that content to all of the hotest platforms around including consoles, Wii, IPhone/iPad, Web (including social networks like Myspace and Facebook), and PC download services like Steam and Direct 2 Drive. Android, Native Client, Xbox 360, and PS3 support have also been publicly demonstrated and are coming during the 3.X product lifecycle.
Yes, Unity is still “young”, but when we have EA and other large studios using Unity it should be a much easier sell to the people you’re trying to convince that Unity is ready for prime time
Forgive me if I am wrong but isn’t Tiger Woods Online using Unity? At one point, it doesn’t anymore, it had the Unity splash screen when it was loading. And that’s a very good, polished game.
I still remember how powerful Unity was on his early days. Now Unity is even better, feature-rich and is used by lots of professional studios.
Don’t get fooled by my forum registration date, I’m watching Unity since 2006. ^^