DO THIS.
» Change Leopard Dock to 2D » Silver Mac
oh how I hated that 3d dock...
Yeh I had leopard on my lovely new macbook when I got it few months back... back when Pro Tools WASN'T COMPATIBLE!!!! oh the pain...
All good now though. Mind that Digi haven't certified 10.5.5 yet, but I wouldn't anticipate huge problems with that anyway.