Everything you've ever wanted to know about GNOME

About.com's GNOME Desktop User Guide

Some useful keyboard shortcuts from another About.com page:

• Alt+Tab Switch between windows. A list of windows that you can select is displayed. Release the keys to select a window. You can press the Shift key to cycle through the windows in reverse order.
• Alt+F4 Close the currently focused window.
• Alt+F5 Unmaximize the current window, if it is maximized.
• Alt+F7 Move the currently focused window. After pressing this shortcut, you can move the window using either the mouse or the arrow keys. To finish the move, click the mouse or press any key on the keyboard.
• Alt+F8 Resize the currently focused window. After pressing this shortcut, you can resize the window using either the mouse or the arrow keys. To finish the resize, click the mouse or press any key on the keyboard.
• Alt+F9 Minimize the current window.
• Alt+F10 Maximize the current window.
• Alt+spacebar Open the window menu for the currently selected window. The window menu allows you to perform actions on the window, such as minimizing, moving between workspaces, and closing.
• Shift+Ctrl+Alt+Arrow keys Move the current window to another workspace in the specified direction.
• Ctrl++ enlarge the screen/text
  
• Ctrl+- shrink the screen/text
  

All of these settings are customizable: go to System->Preferences and there's a bunch of menus there that you can use to trick out your setup (such as Keyboard Shortcuts). I set those annoying windows keys that are next to the alt keys to actually mean something in linux. The right one (Super_R) I use to hide all the windows on the screen and the left one (Super_L) I use to launch a terminal.

UPDATE: To get Nautilus in GNOME to have the location bar (like default in KDE): Open a Nautilis window->Edit->Preferences->Behavior->Always use text-entry location bar ... There's a host of other useful display/behavior options there, too.