If you want a nice overview of the technology being offered for Building Information Modelling (BIM) check out H. Edward Goldberg’s recent Cadalyst article. It covers a range of BIM related solutions from VectorWorks, Autodesk, Bentley Systems, Graphisoft, Gehry Technologies, & 1ST Pricing.
There are concise descriptions of the applications each is offering and how they fit into the BIM process. Given that BIM is a process, more than just an application, it’s good to be aware of the alternatives that are out there!
State of the AEC Industry 2006 - BIM solutions are changing the AEC landscape. - Cadalyst AEC
“Major AEC software companies recognize that BIM, which I'll use to refer to building information modeling, affects the entire building lifecycle, and they are responding.”