What iis the font of the guinnes beer??

Agenda Light  Suggested by jam.villain 

Custom logo: http://www.daltonmaag.com/portfolio

Bell MT
I just found it while using Illustrator CS4
It seems like you can find it on a lot of sites.
I squeezed it a bit to make the letter more narrow and the spaces in the Ns have to be added.

Bell MT is not the font exactly. The G right away doesn't quite match

modified N