Acropolis was a project to make building LOB applications using Windows Forms or WPF much easier than it is today - by moving away from the "blank canvas" approach we currently have in Visual Studio. An early CTP build was released and a lot of folks looked at it and gave back "rich" feedback :-) Certainly it was an interesting development for ISVs building rich client solutions.

The Acropolis team announced this week that there would be no further releases of Acropolis and instead the technology and learning would move into future releases of the .NET Framework.

In the meantime the Acropolis team will be working with the Patterns and Practices team on the new WPF Composite Client - well worth a look if WPF is "your thing".