Usingmac.com has posted a comprehensive list of over 200 keyboard shortcuts for Apple’s Mac OS X Leopard which includes useful shortcuts for:

• Finder
• Exposé
• Spaces
• Dashboard
• Full Keyboard Access
• Spotlight
• Screenshots
• Dock
• Universal Access (including Zooming)
• Boot: Start Up
• Safari
• iTunes
• Terminal
• Mail
• Front Row
• Address Book
• Adobe Photoshop

Full article here.