I’ve only just heard about this. Live Mesh looks very exciting as a way of keeping your own data local but being able to access it in a variety of ways.

A key design goal of the Live Mesh data synchronization platform is to allow customers to retain the ownership of their data that is implicit with local storage while improving on the anywhere access appeal of the web. The evolution of the web as a combined experience and storage platform is increasingly forcing customers to choose between the advantages of local storage (privacy, price, performance and applications) and the browser’s implicit promise of data durability, anywhere access and in many cases, easy sharing. A side effect of the competition to store customer data in the cloud and display it in a web browser is the fragmentation of that data and subsequent loss of ownership. Individual sites like Spaces, Flickr and Facebook make sharing easy, provided the people you are sharing with also use the same site. It is in fact very difficult to share across sites and equally difficult to work on the same data across the PC, mobile and web tiers.