I've long thought about setting up a service that people can connect to with their mobiles or other devices (who don't want or can't root) that basically sanitizes their connection: strips out ads, beacons, tracking cookies, etc.

Or, set up virtual desktops that people can connect to that also use VPNs that could allow people to originate their traffic from a given region.

I'm primarily interested in created a sanitized stream more than anything. People have a right to surf without being tracked.