Running Windows one can always use AquaDock which in a rather flawless way imitates the Mac dito.
Running Classic AMiGA I think that it would be extremely slow using a startbar with transparency that also supports magnifying the icons when held over. A pre-rendered solution would probably work, but then it would instead consume some hefty amount of memory (running a GFX-card that would probably not be an issue, but anyways).
