I have read through several reviews on Amazon and some books seem outdated. I am currently using MyEclipse 6.5 which is using Eclipse 3.3. I'm interested in hearing from people that have experience learning RCP and what reference material they used to get started.
I've been doing Eclipse RCP development for almost 2 years now. When I first started, I wanted a book for help and many people told me, with Eclipse you're better off using the Eclipsepedia and Google.
However, I started with "The Java Developer's Guide to Eclipse" by D'Anjou et al, and I still reference it when I need a better starting point or a good reference. It's probably a little outdated now, but is very thorough and really explains how the Eclipse framework works. Like just about anything, RCP isn't too hard to pick up if you've figured out how the framework supporting it works and you'll get a lot more mileage out of your code.