[Toadling]

It sounds like were getting into the territory of smart folders here. According to earlier postings on this forum, the Omni Group did, indeed, consider smart folders in the early days of OmniFocus, but ultimately opted for the view bar and perspectives.

I think both have their advantages and disadvantages. Fortunately, Ken has stated that Omni Group is already planning on adding smart folders in a future release. But I'm not sure if they'll be added in addition to the view bar and perspectives or as a replacement.

-Dennis