URL-based App Opening

We should provide a way for opening certain URLs to open the relevant desktop app. For example, a Twitter app like Birdie should be able to register that it can handle twitter.com/username links, so clicking a twitter.com/username link could prompt to open it in Birdie or Midori the first time with an "always" or "just once" option. Installing another Twitter app down the road would probably reset this association and prompt the user the next time they click on a twitter.com/username link.

The above is just an example; we'd want the apps to be able to register somewhat complex regex-like schemes to match certain pages of a website with the appropriate place within an app.

Full disclosure: Android does this. :)

Even more full disclosure: Maemo used to do this way before Android picked it up.
We can utilize their library if we wish: http://maemo.gitorious.org/maemo-af/libcontentaction