Anyone interested in a good book on Crystal should check out Crystal Reports .NET Programming, by Brian Bischof.
It may be the best single source available for CR.NET, IMO. (The Wrox title by David McAmis is also a good one, though it's been a bit unfairly treated on Amazon).
It's also fairly inexpensive (compared to other titles).
http://www.crystalreportsbook.com (also available on Amazon)
A few 'caveats'...apparently this was supposed to be published by a larger publisher, but somehow it didn't happen. So I think the author published it himself.
Not surprisingly, there are some typos, misspellings, and the physical quality of the book and type aren't the same as a book produced by a regular publisher. But if you can look beyond 'fit and finish' and want code and a good 'how-to' book that covers many different aspects of CR.NET, this is the one to get.
Kevin