How can I insert a new blank sheet (a new tab) into an existing Google Spreadsheet?  I'm able to duplicate those that already exist on the bottom, but I can't find the menu option to insert a sheet.This is the most basic thing to do in Excel, but none of the documentation seems to say a thing about doing it in Google Docs.
Inserting a New Sheet in a Google Spreadsheet
google spreadsheets
The bottom of the window will list your tabs on the left and have a couple options to the left of those.  Clicking the + will add a new sheet.