Very nice. Throw some charts and graph up in this bitch, compare against time for popularity. I like data.
Mash it up with Crunchbase (?) and see if there is any meaningful correlation between stack and funding rounds, stack and IPO, stack and aquihire, ...
In all seriousness, I would PAY to see this. I would pay extra if you add hosted graph widgets that empirically conclude the largest reciprocal relation between valuation and an IIS/MSSQL stack.