Native OS X Web Apps

Bitchin’!

Fluid 0.7: 

Freeware utility that lets you create your own ’site specific browser’:

Using Fluid, you can create SSBs to run each of your favorite webapps as a separate desktop application. Fluid gives any webapp a home on your Mac OS X desktop complete with Dock icon, standard menu bar, and logical separation from your other web browsing activity.

(Via David Heinemeier Hansson at 37signals; they’ve got icons you can use for Basecamp, Backpack, Campfire, and Highrise.)