Gnome's autostart config

[Chris Kasso <kasso sun com>]

I need to write a script that registers a service to be started when
the user logs into their system.  Depending on the version of
Gnome they are using I need to either modify:

$HOME/.gnome2/session-manual

or put something in:

$HOME/.config/autostart/

What I am trying to determine is which version of Gnome switched 
from .gnome2/session-manual to .config/autostart/.

Does anyone happen to know?

Chris