Have you caught OpenID fever yet? It's the secret sauce behind the new 37signals Open Bar.
Our Why OpenID? page sums up the advantages nicely (e.g. remember just one username/password instead of dozens, getting one is easy, etc.)
We've also created step-by-step guides showing you how to set up Basecamp & OpenID and Highrise & OpenID. These guides will make your login switch a breeze.
Once you go OpenID, you'll never go back.