I read SCWCD Exam Study Kit 2nd ed. and Head First Servlets and JSP. Both book are good, but HFSJ is more attractive, funny and easier to read. However HFSJ has MANY errata (more than 130 points!), everyone who read HFSJ should check HFSJ errata list.
If HFSJ has not much errata, I think it's a perfect book for SCWCD exam.
I like HFSJ very much, and hope the authors consider to write Head First Java Web Services book.
SCJA 1.0, SCJP 1.4, SCWCD 1.4, SCBCD 1.3, SCJP 5.0, SCEA 5, SCBCD 5; OCUP - Fundamental, Intermediate and Advanced; IBM Certified Solution Designer - OOAD, vUML 2; SpringSource Certified Spring Professional
BTW - We think we fixed the errata a while back - if you have an older book we are sorry that you will have to deal with some errata, but if you just got your book recently, that shouldn't be an issue. If you did just recently get your book, and you find any errors, please let us know!
Spot false dilemmas now, ask me how!
(If you're not on the edge, you're taking up too much room.)