I'm building a product and API that would take advantage of the whole collection but it's not ready for primetime yet.
http://www.uscourts.gov/FederalCourts/UnderstandingtheFedera... http://www.fjc.gov/
States are a grab bag but generally statistics poor.
But that's the kind of thing I'm working on and I'm sure others are as well.
The State Decoded takes a more Jeffersonian approach (appropriately perhaps, given that it's based in VA), allowing citizens to code up their own state statutes. PlainSite in contrast is more Hamiltonian: centralized and standardized. There are advantages and disadvantages to each approach.