Steve Muench published his ADF version of the Toystore Demo: see http://otn.oracle.com/products/jdev/collateral/papers/10g/adftoystore.html. I have not yet tried it out but it should be a comprehensive example of using ADF for building a fairly complete application. For tips and background also see his weblog.
Lucas Jellema, active in IT (and with Oracle) since 1994. Oracle ACE Director for Fusion Middleware. Consultant, trainer and instructor on diverse areas including Oracle Database (SQL & PLSQL), Service Oriented Architecture, BPM, ADF, Java in various shapes and forms and many other things. Author of the Oracle Press book: Oracle SOA Suite 11g Handbook. Frequent presenter on conferences such as JavaOne, Oracle OpenWorld, ODTUG Kaleidoscope, Devoxx and OBUG. Presenter for Oracle University Celebrity specials.