Earlier this month, 37signals added a One Bar feature to allow users of their Basecamp project management and Highrise correspondence tracking services to sign into both sites at once. Fortunately, after issuing a major update to Backpack, their wildly popular web-based PIM app, they have added Backpack to the One Bar signin. This will save some time and simplify switching between these services, and the only requirement of One Bar is an OpenID, an increasingly adopted service that allows you to tie website logins to one single ID and password for the ultimate in web security and convenience.
