If you have a Mac, and you tend to spend time with the same tabs open in your web browser, then have a look at Fluid.

It’s a similar idea to Adobe Air except with Fluid you create your own apps using web URLs. As an example I’ve created one with Google Reader.

Your App can be added to your dock, run separately from your web browser and can even have a badge showing the number of unread items. And it even works on pre-Intel Macs, but you must have OS10.5 or later.
Find Fluid online here.
