Discussion Feature Added to Google Spreadsheets

Discussions were added to Google Docs and Presentations earlier this year.  Now you can add discussions (comments) to spreadsheet cells. To create a discussion, click on a cell to select it and from the "Insert" menu choose "Comment"

If a cell has a discussion in it, you'll see an orange triangle in the upper right corner of the cell and when you click on the cell, the discussion will pop up.

For more info and details read on at: http://googledocs.blogspot.com/2012/09/google-spreadsheets-now-with-discussions.html

Pivot Tables Now in Google Spreadsheets

Google Docs Spreadsheets now support Pivot Tables. See the video demo below for details.

Source: Official Google Enterprise Blog: Pivot Tables now in Google spreadsheets

Filters Added to Google Spreadsheets

Google Spreadsheets New Filter Tool

Google Spreadsheets now has a filter tool to enable you to select and view subsets of your spreadsheet data.

For more information and an illustrated Quick Start, visit the Google Docs Blog posting Filter your data in spreadsheets.