Our new Coalition Overlordstm have launched a new web-site to solicit feedback from the citizenry on what laws should be repealed/modified. This is a little more involved than the current option to sign e-Petitions at the number 10 website. The site supports commenting, tagging as well subscribing to feeds for each idea. I'm quite impressed if this site has come from zero to production since the new government took power.
Of course experience with the e-Petition site has shown governments are quite capable of ignoring causes with popular support. There are also issue of selection bias, astro-turfing and inclusion of people without broadband connections. However it's an interesting experiment and we'll see where it goes.