I just cleared SCWCD with 84% and would like to share some information about my preparation for whoever might be studying to pass the same cert.
1. Study material (in strict disorder): - the JavaRanch Forum posts (thank you all, btw :-) - "Head First Servlet and JSP" (HFS) + errata ( http://www.oreilly.com/catalog/headservletsjsp/errata/ ) - some chapters from the old edition of "SCWCD Exam Study Kit" (ESK) and the final review section - some sections of the Servlet spec (SRV.8 on Dispatching Requests, SRV.12 on Security, SRV.13 on Deployment Descriptor, the API sections) - some sections of the JSP spec (JSP.2 on EL, JSP.5 on Standard Actions) - Marco Tedone's amazing SCWCD reminder ( http://www.jemos.co.uk/internal/ )
You might wonder why I used an outdated book (my copy of ESK was for exam 310-080)... That's because I've been wanting to take the exam since last year and took a lot of time to pick a date, in the meantime the exam had changed. Anyway, keeping HFS as the main source, information in some chapters of the old ESK was a good complement (for instance, Classic Tags) and the final review was quite helpful - always keeping in mind that some information is not relevant. In the end I think one good book backed by the specs does the trick.
I also downloaded the free trial version of EnthuWare's JWebPlus ( http://www.enthuware.com/jwebplus/index.html ) but didn't have time to use it - just like for the JavaRanch mock exam and the jdiscuss tests ( http://jdiscuss.com/Enthuse/jsp/ShowAvailableTests.jsp ). One short note about the HFS final mock exam results: be it because it was late or because my little gray cells were tired, but yesterday evening I scored miserably (37 correct answers out of 69)... Sometimes the real score is a good night sleep away from any mock test.
Well, hope this posting is of some help! Thank you & all the best, not only for certification. Ciao,