CA exposes Restful web services. My client wants to utilize C# to invoke these Restful web services. I have c# experience, but zero experience with web services with C#. Any pointers on where to start, and what good books (paper back or ebook) will be great.
Even though your question is off-topic for SO format, I'm posting this answer because REST is becoming mainstream nowadays.
For consuming RESTful APIs you could use any http client you can get, as long as it allows you to properly customize the requests.
I recommend RestSharp for this purpose. I've used it before and it does it's job.