Charts to visualize data and track progress

I would very much love the ability to create chart views of data. Ideally for me this would be a particular view for a filtered set of objects of one particular object type. Alternately, a block type called "charts" that queries a set of objects for a particular type of chart display would be really cool.

Particular charts that would be really useful include:

* Summary stat of a particular property belonging to each of the objects returned by the associated filter (Sum, average, etc.), displayed as a simple numerical object with a title and styling to make it clear

* Line graphs plotting two properties against each other (x and y axes)

* Bar graphs showing summary stats of one property broken out by another property (i.e. each bar might represent a category/label within the resulting object set, and the size of the bar is the summary stat of all objects with that label, and there would be bars for each label represented in the set of objects returned)

* Pie charts showing a percentage breakdown of objects within a set that have a particular single-select attribute