How to seperate the "drive by" topics from the "deeper" discussions?

[mcwumbly (Dave McClure)]

“How do I handle different types of users, with different goals, on the same platform?”.

This is an area of general interest that I have as well:

Category spread in digests

Our forum is used internally within our organization. The org is heterogenous, with several groups that have different primary interests…The issue is also one of the things motivating the request for this feature.