In Firefox, I have a toolbar with all the links I regularly open. I use “folders” for them. I have a “stats” folder with shortcuts in it to all the stats pages I check. I have a “school” folder with links I use for school. I have a “dev” folder with geeky things in it, and even a “technorati” folder!
Flock doesn’t seem to allow me to make folders in what I’ve called my “Quickbar”, and that’s a shame. Sure, I can make different collections of links and then switch from one to another using the toolbar toggler on the right, but it’s not as intuitive as just having a bunch of folders.