You can speed up your productivity when working in Adobe Illustrator CS4 by using keyboard shortcuts. Study this list of commands and their keystroke combinations for selecting and moving objects:

To Do This Mac Shortcut Key Windows Shortcut Key
Activate Selection tool last used (Select, Direct Select, or Group Select)     Ô+any tool (except Selection tools) Ctrl+any tool (except Selection tools)
Toggle between Select and Direct Select (or between Select and Group Select) None Ctrl+Tab
Add to or subtract from selection Shift+click with any Selection tool Shift+click with any Selection tool
Select All Ô+A Ctrl+A
Deselect All Shift+Ô+A Shift+Ctrl+A
Move selection in 1 pt increments Any arrow key Any arrow key
Move selection in 10 pt increments Shift+press any arrow key Shift+press any arrow key
Constrain movement to 45° angles Shift+drag with any Selection tool Shift+drag with any Selection tool