This is a great App (PicPlz) that allows you to "check in" on Foursquare with a photo of where you are.
Sadly (at the moment) it is only available in the US on Android but will be coming to the UK when it comes out of Beta.
Life streaming is gathering a pace. So far I am seeing many adaptations on RT arguably this is a third gen adaptation that could not exist without foursquare or twitter. There are more coming.
I'll be blogging about it when the UK version comes out.