Well we'd like mbarcode to do that eventually, if anyone feels like writing a plugin to do this please join in and we're currently trying to sort out the Python bindings so that people can write python bindings to use with it.

In terms of what I'd like (other than to finally get mbarcode into a state where it doesn't consume loads of time ) - augmented reality, and namely a mash up of Google maps + nethouseprices overlayed on the camera.