Google Spreadsheets now lets you view more of your work on-screen. Ctrl+Shift+F toggles between three modes: hide header, hide header and toolbar, and show all.

Editions impacted:
Standard, Premier, Education, Team and Partner Editions

Languages impacted:
US English

How to access what's new:
Ctrl+Shift+F toggles between the three display modes when you're viewing a spreadsheet.

For more information:
http://docs.google.com/support/spreadsheets/bin/answer.py?answer=66280