The whole point of cloud computing and Google Docs is to make your life easier. Recently I moved our teacher email list that was on our website to a Google Spreadsheet and used the Publish feature to make it available on our website. The issue with the spreadsheet was you were unable to click on the email address to automatically open your email program and set the To: portion in your program. Until now.
A little back history on this subject, like a lot of people I have multiple Gmail accounts that I actively use, my personal, my work (K12) and my college account. Up until now I have had to log out of one to login to the other which becomes a pain. Up until this point I had no idea you could stay signed into multiple accounts. Not to mention its easy to setup.