I got the new book from Matt Lombard last week, "SolidWorks Surfacing
and Complex Shape Modeling Bible". I'd highly recommend it.
I've been a casual SW user for a year or so, and am getting more
serious about using it for product design now. I don't have any
experience developing with surfaces directly, this book breaks it down
nicely so that you can develop a good workflow for analyzing a part
and modeling it.
Amazon.com has it of course.
http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470258233,descCd-DOWNLOAD.html
