We looked at site-specific browsers last year – desktop applications that capture a single web site so that you can interact with it outside the bounds of your browser. A new entrant in this field, Bubbles, is out with some intriguing features that advance the state of the art.
The new features revolve around an API that lets you customize Bubbles for particular sites. WIth these customizations, you can do things like show notifications when a new email arrives at GMail, or upload to Flickr via drag-and-drop. Bubbles is currently Windows-only and in beta, with a developer community starting to coalesce around it.