If it's OK to put out that data, why not in a zip file?
Well look, if you're so sure that this data is useful and non invasive and non personal data, then why not just put it out in a zip file as raw data? Why invite proposals for Web 2.0 apps?
Slapping a pretty Web2.0 app around it, won't stop it being mined. It only makes it a little harder. So any data you put out, whether in Web 2.0 or raw data, it will be extracted.
So you put it out, in raw data on a website. People do their Web2.0 apps. You scream in horror as you realize that (a la AOL) it can be cross linked to other data to create a personalized set of data used to single out and victimize citizens. They vote your nasty ass out of office, and I laugh my Pertwee off.
Because you're entrusted with data you're supposed to keep private, and need to have a good reason that outweighs the bad reasons to release it.
So you want to put out NHS health stats, but health insurance companies will use that to weight their charges against people living in areas who use a lot of NHS services. And so will car insurance companies, because sick people don't drive so well, and scammers will use it to target pills and potions, etc. etc., we can't even imagine the possible combinations of data that THEY have cross linked to the data that YOU have. But if you put it out, we'll find out.
What could possibly go wrong?