We have commented before the competition to choose the best notation the Best Modeling Notation for Requirements Engineering held as part of the RE'09 Conference (see this post for the competition description and this other post for a summary of the results).

It's always nice to have good examples of domain models. Jukka Tamminen is releasing from time to time models for well-known domains in his blog , the latest one a class diagram and a communication diagram for the airline business domain.

Models can be downloaded in XMI (StarUML format) to facilitate their reuse/modification

Some time ago, Johan den Haan pointed out that "MDA had been patented" . Indeed, if you read the description of this patent, they use the notions of platform-independent and platform-specific "components" and the idea that platform-specific components could be generated from the platform-independent ones. Sounds familiar? (and, by the way, the patent is from 2009 much later than these concepts were included in the MDA OMG standard)

One of the reasons that have motivated the WebUML initiative (commented here ) is the problem of exchanging UML models among different modeling tools.