This is an older news but it’s still worth to mention. Google pushed an early release of Google Gears (beta), a plugin for your browser that will allow your web applications to work offline. It features an embedded SQLight database which is directly accessible via javascript. Dojo already integrated it’s offline storage to work with Gears. The Google Developer Podcast #3 featured Mike Tsao of the Google Gears team and one of the things mentioned was that there is no support for synchronization. As I just discovered the SDO specification something tells me that using SDO’s to sync up with the server side could be a possibility. As SDO’s are xml, the problem (of how you should create the SDO in order to sync up) I think with this approach is that you would need to manipulate a lot of XML in the browser which could be done either with a JS library, E4X (maybe) or another browser plugin. Do you think using SDO’s could be a viable approach? Classic web services are also a possibility. Any other ideas? Google Gears is available both as a IE ActiveX plugin or a Firefox extension. Developer site here.