Fluid was updated last week to version 1.7. Fluid is the website specific browser and I use it to turn webapps like Pinboard or Checkvist into a standalone applications. Version 1.7 brings better Retina support and regex support for whitelists and user styles. There's also support for Notification Center now but you must rebuild your Fluid app to enable it.
I'm a big fan of Fluid. It allows me to isolate browsing sessions and leverage app-like behavior on my Mac like application switching.