Well Google has just released the cloud connect for Microsoft office is something like same document can be shared by multiple people.
For example we can share our familiar office products such as MS word, Excel etc with more people. i.e Every one can edit the document at the same time while discussing over phone.
It is definitely a very good Google achievement.
You can download the plug in from the below link,.
http://www.google.com/apps/intl/en/business/officeconnect.html#utm_campaign=launch&utm_source=en-na-us-entblog-cloudconnect_02242011&utm_medium=blog