I took the IBM 257 Enterprise Application Development with RAD v6.0 today and passed it.
I have 5 years large project experience and had been involed in WSAD/RAD developement for 2 years.
Following is the ref books, being downloaded from IBM redbooks
01.sg246449 Rational Application Developer V6 Programming Guide.pdf
02.sg247257 Web Services Handbook for WebSphere Application Server 6.1.pdf
03.sg246681 IBM Rational Application Developer V6 Portlet Application Development and Portal Tools.pdf
The test is hard, containing the Web, EJB, Web services, Database Connectivity, Security and Tuning & Troubleshooting et al. If you have passed the SUN's EJB and Web service and Web Developement, I think 257 is a piece of cake for you. If you want a good score, much experience of WSAD or RAD will help you.
[ March 08, 2007: Message edited by: The Deep ]
[ March 09, 2007: Message edited by: The Deep ]