A Collection of Common Aspects to be Used With Unity Built on Other Application Blocks
Aspects such as a Logging, Authentication, Authorization, Performance Monitoring, Caching, etc... that do not require attributes but can be configured by interception. Though perhaps attributes can also be used to add them.
A common set of these would help remove a number of cross-cutting concerns from all manner of developer's applications.
Isn't it what PIAB is for? http://msdn.microsoft.com/en-us/library/ff664572(v=pandp.50).aspx