[Blatchara]

In response to those who want to look at tasks from multiple contexts, why not command-click on the contexts to select more than one (non-contiguous selection)? It works for me, and I get a list that can be further grouped and sorted as usual by the filter bar. I had remembered noticing this earlier as one of those beautiful touches that you don't always expect to be implemented at this stage.
There's a much more complicated question in this thread also, but I think this answers the multiple context issue.