A hint on macosxhints talked about double command-clicking on text URLs doesn't work anymore because command dragging is for discontiguous text selections. Well guess what else Apple changed in Leopard: they added column selections!
In Terminal, TextEdit, and probably any other app that uses core-text rendering, you can now:
- command-drag over other text to create a discontiguous selection
- option-drag a region to create a rectangular text selection (yay!)
- command-option-drag to select discontiguous rectangular text selections (wow!)