Do we have any good resources on WebServices Security? Any book, pdfs, articles and even the detail answers regarding the securing web services would be appreciated.
OWASP (The Open Web Application Security Project) provides a lot of resources for developers and pen-testers.
OWASP is an open community dedicated to enabling organizations to conceive, develop, acquire, operate, and maintain applications that can be trusted. All of the OWASP tools, documents, forums, and chapters are free and open to anyone interested in improving application security.
To the degree that web applications qualify as web services, are accompanied by web service APIs, or can be hardened/probed using the same techniques as web services, OWASP is a great resource.
You might start at their Web Services page.