This is powerhouse stuff that was normally only available to larger enterprises... Organizations like the brokerage house BMO-Nesbitt Burns use expensive RSA SecurID two-factor authentication solutions for employee remote access. Google is bringing the same two-factor authentication capability to our Google Apps customers through the use of mobile phones for no additional cost.
Ultimately any system open to the Internet is only as secure as your passwords. The problem with passwords is that employees tend to over use them across many websites and systems. Even if you force regular password changes many employees will rotate a single character leaving it easy for former employees to guess.
With two-factor authentication the employee must supply the password (something they know) and a one-time verification code from their mobile phone (something they have).
Only cloud computing can deliver rapid innovations like two-factor authentication at such a low cost and with no upgrades to install.
And by the way, 1 million businesses have adopted Google Apps in less than 12 months bringing the total to 3 million businesses and 30 million users.
At Interlockit.com we're always available to help with your Google Apps setup.
For more details visit: http://googleenterprise.blogspot.com/2010/09/more-secure-cloud-for-millions-of.html