1) XML Schema / SOAP/ WSDL
I am looking for some decent tutorials on XSLT/XPath. Currently I have been using the www.w3c.org and O'Reilly. If you have any suggestions on alternative tutorials/locations let me know.
3) SOA Specific Articles / Books
Thomas Erl and his series of publications are a must. http://www.soamagazine.com and http://www.soabooks.com
Finally although not specifically for SOA but rather all the other technologies like AJAX, OOAD, HTML etc the Head First series from O'Reilly is excellent.