Interesting topics in Siebel

Siebel DataModel-Interesting and tough
Virtual Business Components
Siebel Websrvices(APIs)
Siebel Workflows
Business Service Simulator
Workflow Instance Monitor
Localization-Implemting Siebel in Local Language
DataMaps/Value Maps
Debugging Workflows
Siebel Business Services(Scripting)
Siebel Integration Architecture etc..
Integration Objects and XML Concepts from IO perspective