I have a Gmail address with my employer, a personal Gmail address, and a Gmail address for my personal business. My girfriend also has a Gmail address she uses on the same PC. Currently this requires much logging in/out to switch between everything because besides Gmail I use Google Docs, App Engine, and other sites that use the same credentials.
Is there a way to keep all of these accounts open in the same browser at the same time without constantly having to log in/out?