Hello,
The page might not be completely up to date, because not many books are published on Web Services topic. Moreover, SCDJWS does not have a study guide, like
SCJP - K&B book.
Good news: everyone can edit that page, you can contribute if you find some good book.
RMH book is still good for XML/namespaces/Schema/WS-I BP understanding.
Besides the Links Page, you can use
search function on this forum, and read experience from the people who passed the
test.
HTH,
MZ