I have a couple of saved searches, primarily to see all the items for a given project (hash-tag) regardless of their context (it's a GTD thing).
Since I'm using colours for priority (1-now, 2-soon, etc) I would really like to be able to sort the results by colour - ascending at a minimum but if you can throw in descending too that would be awesome.
It would also be perfect to turn on and off the breakdown by document (in my case a document is a GTD context) so that all the colour-1 items sort together regardless of which document they are in. The containing document could be shown somewhere within the item, perhaps right-aligned to the left of the item bullet.
(this is 2 of 3 GTD related features I'm proposing today)