There is so much data in government that could be useful for everybody. Just a quick brainstorm produced this:

I would like to see easy access to data from the Consumer Product Safety Commission (and all relevant organisations from around the world), and to be able to have this linked directly to products.

You could then take use your phone to take a picture of a bar code while in a store and an app would check this against the above data for historical information about the vendor.

In the US and UK I see some effort being made with the new government portals to download data, I just wish this practice would be come more common around the world.