Business Objects has released two tools to make learning and using the reporting API much easier. Here are some links:
Navigate the APIs related to Crystal Reports - view reporting and enterprise reporting API classes and objects etc. The interactive object model interface will take you through a decision tree of high level functionality questions related to your application and drilling into the object model boxes provides detailed access to the complete model structure. The right panel operates as a help screen and is context sensitive to the objects you click on.
http://support.businessobjects.com/global/interactive/xi/om/default.html?extcmp=devnews_na_0508_intobjmod
Using a Decision Tree to Navigate Complex APIs - The increasing complexity of software makes the task of selecting the right tool more and more difficult. This article references the above Interactive Enterprise Reporting Object Model as one possible solution to complex evaluations, and acts as a guide to the Object Model interface.
http://www.businessobjects.com/global/pdf/dev_zone/om_article.pdf
HTH,
Brian Bischof
www.CrystalReportsBook.com