You want to learn about WebSphere? How about my book, What is WebSphere? It's a classic!
If you dont' want to pick up a copy, check out my website:
www.pulpjava.com. It's all about J2EE, but is very IBM and WebSphere centric.
For learning web services, especially if you're an IBM person and can get your hands on a copy of IBM's Rational Application Developer, I suggest that you create a JavaBean, and then use the WebServices Wizard to create a web service based on that JavaBean. The code will create a vanilla web service that you can immediately
test, and then fiddle with, break, improve, and explore. It's a great way to learn.
Cheers!