Ummm follow these steps
1. Build latest pcmanfm from the GIT repository - Follow this page and take not of the build requirements for FEDORA
http://wiki.lxde.org/en/PCManFM_build_and_setup_guide
(The default package in fedora 14 has a bug that doesn't allow multiple instances, hence the need to build your own as per the above link. It's a bit of a pain but only needs to be done once)
Test you can run pcmanfm
2. To replace pcmanfm for gnome places you may need to edit these files
/usr/share/applications/gnome-nautilus-computer.desktop
/usr/share/applications/gnome-nautilus-folder-handler.desktop
Replace nautilus with pcmanfm. Also in gnome-nautilus-computer.desktop remove computer: from the exec= line because it's not support by pcmanfm and I'm not sure how to get it to default to computer:/// from the command line
3. Install gconf-editor package and go to apps - nautilus - preferences and unselect show desktop
4. Create a startup application and have it run pcmanfm --desktop
5. reboot and test
5. Uninstall nautilus with yum erase nautilus
This will provide almost instant login times, and remove the bug for nautilus taking 1000 minutes (long time) loading folders in list view