Use your web applications, like Gmail and Google Calendar, just like desktop applications.
Bubbles is simply but clever way to use web applications or sites just like desktop applications. You just add your favorite web sites in Bubbles settings and after that you can use them in their own windows and they sit in the system tray. Bubbles has some web applications pre-configured and they have some extra functionality. There are Google Calendar, Gmail, 30 Boxes, Yahoo Mail and Flickr. You can for example upload photos by dragging them into Flickr.
Some applications just work so naturally as desktop applications in Bubbles. My favorites is to use SlimTimer with Bubbles.