Topic: Keyboard Secrets for Screen Captures in OS 10.3.9 and Tiger
(apple+shift+3)= whole screen pdf saved to desktop
(apple+shift+4)= select area as pdf to desktop
(apple+control+shift+3)=whole screen pdf saved to clipboard...
(apple+control+shift+4)= select area as pdf saved to clipboard...
When using the (+control) clipboard method, open "Preview"-->File-->New from Clipboard. Then save as any format you wish: usually png, gif, jpg for web, or psd for PhotoShop.
(Tiger doesn't need Preview to convert pdf to png, though.)