Right now, it is possible to 'bookmark' individual tags, using Tag Groups. I suggest allowing the addition of more complex search queries to this panel.

For example, I might want to often access all of my Ideas that are not necessarily specific to App, Game, or Video, and thus not given any of those tags that are common among my other Ideas, so I would have a bookmark for the query "+Idea -App -Game -Video". This would allow more automated, cleaner, less clumsy organization than, say, tagging all of those documents with "MediumAgnostic" or manually typing the above query in every time.