Fluid lets you create a Site Specific Browser (SSB) out of any website or web application, effectively turning your favorite web apps into desktop apps.

Using Fluid to create an SSB out of your favorite website is simple. Enter the website's URL, provide a name, and optionally choose an icon. Click "Create", and within seconds your chosen website has been converted into a fully native Mac desktop application that appears in your Dock.

I've got to give it up for Fluid, which I discovered just last week and played with a bit over the weekend.

So far I've created exactly one SSB (Site Specific Browser) -- for my 37Signals Backpack -- but just that one is very, very cool.