OPEN is interesting to me precisely because their business model does NOT depend on consumer fad behavior. I know exactly what you're saying about CROX. The difference here is that OPEN supports the innate consumer habit (not fad) of constantly searching for a good restaurant and needing to make a reservation to guarantee a spot. It's also well-done that customer reviews and menus are available with one touch before you book. But the best part is, if a restaurant doesn't license their nicely-integrated reservation system, that restaurant doesn't appear as an option. The more popular opentable.com becomes, the more business the good restaurants get, and OPEN gets steadily-growing license revenue. Talk about a win-win growth opportunity?!
I use the OpenTable app from my iPhone in my home town, and also used it on business travel in both San Jose and L.A. over the past 2 weeks. Fabulous, like nothing else! (Don't think of this as just a computer website - the mobile phone app is the finishing touch to a beautiful, complete package!)
I'm old, and not involved with Open Table. I've seen this sort of business pattern before. It's a very rare thing of beauty.