Show or Hide Slices

Both: Q

In Photoshop 6 and 7, the Hide Extras command (Cmd + H) [Ctrl + H] also hides/shows slice guides.

Show or Hide Rulers

Menu: View Show/Hide Rulers

Mac: Cmd + R

Win: Ctrl + R

Show or Hide Guides

Menu: View Show/Hide Guides

Mac: Cmd + ; (semicolon)

Win: Ctrl + ; (semicolon)

Show or Hide Guides

Menu: View Show/Hide Guides

Mac: Cmd + ' (apostrophe)

Win: Ctrl + ' (apostrophe)

Toggle Snap

Menu: View Snap to Guides

Mac: Cmd + Shift + ; (semicolon)

Win: Ctrl + Shift + ; (semicolon)

Toggle Snap

Menu: View Snap to Guides

Mac: Cmd + ; (semicolon)

Win: Ctrl + ; (semicolon)

In Photoshop 6, (Cmd + ;) [Ctrl + ;] toggles the Snap command or whatever is checked in the View Snap To menu.

Lock or Unlock Guides

Menu: View Lock Guides

Mac: Cmd + Option + ; (semicolon)

Win: Ctrl + Alt + ; (semicolon)

Toggle Show/Hide Grid

Menu: View Show Grid

Mac: Cmd + ' (apostrophe)

Win: Ctrl + ' (apostrophe)

Toggle Show/Hide Grid

Menu: View Show Show Grid

Mac: Cmd + Option + ' (apostrophe)

Win: Ctrl + Alt + ' (apostrophe)

Toggle Show/Hide Grid

Menu: View Show Show Grid

Mac: Cmd + "

Win: Ctrl + "

Toggle Snap to Grid

Menu: View Snap to Grid

Mac: Cmd + Shift + ' (apostrophe)

Win: Ctrl + Shift + ' (apostrophe)

Toggle Snap to Grid

Menu: View Snap to Grid

Mac: (Cmd + ;)

Win: [Ctrl + ;]

Toggles the Snap command for guides, grid, slices, and document bounds.

Snap Guide to Ruler

Mouse: Shift + drag guide

Toggle Guide Orientation

Mac: Option + drag guide

Win: Alt + drag guide

The Window Menu

Close All Documents

Show or Hide the Optimize Palette

Show or Hide the Info Palette

Show or Hide the Options Palette

Show or Hide the Color Palette

Show or Hide the Swatches Palette

Show or Hide the Brushes Palette

Show or Hide the Layers Palette

Show or Hide the Channels Palette

Show or Hide the Animation Palette

Show or Hide the Slice Palette

Show or Hide the Rollover Palette

Cycle Through Open Documents

Steal the Attributes of an Open Document