Yum!

...I keep thinking he's dead after having watched P.S. I Love You (not a spoiler, promise!) Must stop that.

Also agree with the Hugh Jackman idea...he'd be able to do it (but I'm biased, i'm an Aussie and a fan).
Orlando bloom was a bit Errol Flynn in the end of Pirates 3, but not quite Greebo enough for me.
I love Depp, and think he oozes sexuality right enough (drool) but he's not Greebo either.
The Greebo in my head doesn't have a real life counterpart...