I passed the SCWCD with 88% today. Eight weeks ago I started with SCJP1.4 (95%), then I succeeded with SCBCD (94%) and two weeks ago I passed SCEA part 1 (95%).
I haven't developed servlets or JSP's before. Originately I had no plans to make the SCWCD as my goal is mainly SCEA. However, I thought that it is necessary to have some understanding of Web Component Development in order to succeed with the SCEA assignment. So I read the book "Sun Certified Web Component Developer, Study Guide" (skipping all exercices and most self tests). I felt that these topics (servlets, JSP and Tag libraries) are technically quite "simple" and decided to go for the certificate. I also read through the study notes posted by Frederic Esnault (useful to have all important stuff in a compact form).
I lost some points because two or three questions had not been covered by the material I read (this time I didn't want to read the specs as I did in case of SCBCD) and probably because I couldn't memorize all of JSP and JSTL related syntax. But regarding the time I spent for preparation (2 weeks; 3 hours per day) I am happy with my result.