It's been a long time :-), but IBM is publishing white papers showing IBM Lotus Domino as a RADD tool, describing its benefits as a collaboration platform and the tool to succeed in Web 2.0: XPages.
Nice morning reading :-)
The open standards-based IBM Lotus Domino platform features XPages technology, which provides one programming model for developers to build applications for desktop,browser and mobile experiences. This comprehensive platform
integrates secure and semistructured data storage, application-level security, robust user directories and built-in messaging services that support human-facing workflows.