As many as we can, but lets go for something with marketable impact
just to be reasonable here ;).
I work in Burlington and probably spend half my life in that city, the
other half here.
Public transit, such as bus/train (does GO have an API?).
Events. I know there's constantly something going on by the
waterfront.
Food, restaurants, etc. I've seen a food inspection site for Hamilton
somewhere that posts all the food inspections online, I just can't
recall the site.
Roadwork. (Dude, I wish I knew when they were going to change lane
closures on that fairview construction zone, I go through it every
day, and one monday late at night they blocked the whole street).
Finances -- I know this is probably a big one, but this would be
amazing to just drop out "Yeah, here's the books." for everyone to
see.
I can't think of any others off the top of my head, but with sets like
this we could probably prototype something that gets people excited.
But don't stop with my ideas, keep listing things, or even better,
ways we could combine these sets!