Web Service / WSE Resources
Just saw a post from Brian Groth regarding a new tool from MS researh called TulaFale, dealing with securing of web services. While I haven't yet tried the tool (but I do intend to), the page listed above for downloading the TulaFale tool also contains an absolute wealth of links to resources dealing with web services and security related aspects. I recommend visiting the page if for nothing else other than the resources listed on the page.