This is Optima from Linotype:
http://www.linotype.com/searchresult?q=optima

This is also a standard system font included with Mac OS X.

Mikey :-)

I thought the same, however, when you have capital letters, Optima has a slight curve in letters like L, I, N. This one has straight stems at 90 degree angles.

The difference is most likely a product of image compression.

Also have a gander at Optima Nova:
http://www.linotype.com/54142/optimanova-family.html

Mikey :-)

Could be the Bitstream version: Zapf Humanist 601.

That's it! Thanks, Jan (and SuperUltraFabulous) =)