Just a short note about changing menu items in gnome in fedora 16.
The location where the shortcuts are held for everyone is:
You can have user specific menu items, just like windows and this is under the users profile. I believe these are under:
The application shortcut files are pretty intuitive and look like:
Name=mythTV setup - DO NOT RUN AS ROOT
Comment=Setup for mythTV.
Exec=mythtv-setup -geometry 1156x650+60+100 -w