Here is an easy way to get up and running with Nokia N800 development.
Here is a VMWare image containing Ubuntu and all of the required N800 development tools (scratchbox, xephyr, etc.) pre-configured for you.
I’m downloading it as we speak. This will simplify things greatly compared to trying to get a development environment up and running under Fedora.
Maemo Development Appliance – VMTN Virtual Appliances