Google has been so busy with changes and improvements, Google Watching has become almost a full-time job.

A slight exaggeration.

One recent announcement is a security enhancement that is being rolled out to work across many of Google's products and services.

It is called Two-Factor Authentication (link is to the announcement in regard to Google Apps).

The basic idea is if you have to both HAVE something (a street address, a particular phone number, etc.) and KNOW something (a password) it makes it much harder to hack into your accounts.

Matt Cutts talks about future use with other services / products.