Copy Google Spreadsheet to another Sheet
I just noticed that in the new UI of Google Spreadsheets, you can not only copy a page (or sheet) to a copy of itself within the same workbook (collection of ‘pages’ in one ‘file’) but you can now copy a sheet all the way into an entirely different notebook.
This was apparently announced 5 days ago on the Google Docs blog, and you can find more information from the Google Docs Help guide.
Click the menu arrow in the sheet you want to copy and click “Copy to…”
Then a pop-up appears allowing you to browse where you want to drop the copy:
Really. This is pretty killer.