Yesterday I took exam 70-554, which is second part to upgrading existing MCSD.Net certification to MCPD Enterprise developer. Exam 70-554 is combination of 70-529 TS and 70-549 PRO exams.

I had to take this exam twice since first time I almost passed (I guess I missed with 2 questions). 70-529 had many WSE 3.0 questions which I was not so strong.

I did well with 70-549 exam for both first second time although I did not study for this exam (.NET experience since 1.0 beta 2 helped). For the second shot studying WSE 3.0 worked for the exam. 

WSE 3.0 Quickstart samples, hands on labs and videos from WSE 3.0 downloads and self-paced training book for 70-529 are good resources for WSE 3.0