You have installed the MacPorts GNOME desktop suite meta port!

Further information is available from the web at:
http://trac.macports.org/wiki/GNOME

You can subscribe to the MacPorts Users mailing list at:
http://lists.macosforge.org/mailman/listinfo/macports-users

The mailing list is the best way to resolve MacPorts GNOME issues.

Questions
==========================================================================
1) What is the GNOME desktop suite?

2) How do I get GNOME running?

Answers 
==========================================================================
1) What is the GNOME desktop suite?

The GNOME desktop suite is the complete set of software packages required to
have a complete GNOME/GTK-based desktop environment.

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2) How do I get GNOME running?
Place the following in your .xinitrc 
(copying the one from /etc/X11/xinit/ is advisable):

# start the window manager
PATH=@PREFIX@/bin:$PATH
exec gnome-session

See also:
http://trac.macports.org/wiki/GNOME#RunningGNOME