I will suggest for "Sun Certified Web Component Developer(SCWCD) Exam Study Kit" of Manning Publication by Hanumant Deshmukh and Jignesh Malavia
This is really a very good book. I recommend this book for three things: Writing Style: Very friendly and easy to understand. Coverage: It covers all the topics required for the exam. Besides that it also covers topics like Filters which are very useful in real life programming. Value for money: Besides excellent coverage of topics, it comes with a scaled down version of JWebPlus and tons of usefull software and material on the CD. The Exam Quick Prep section in the end is just marvelous.