I thought about breaking this out into its own thread, and might later, but I think there are only a handful of XL1B users and hopefully they will find this post via a search.
1) Download MediaChanger.zip
unzip the file and copy the MediaChanger.exe out of the Debug directory to somewhere in your path
2) Stop and disable the RSM (Removable Storage Manager) service (This is a important step/requirement for non MCE users)
3) open a cmd prompt and cd into the directory you copied MediaChanger.exe into and run:
If all is well you should see something like
drive: empty, source=-1
Now execute MediaChanger without any arguments for usage syntax
mount the disk in slot to the drive
ChangerControl unmount 
move the disk in the drive to slot . If is not
specified then put it back to the slot that it came from.
ChangerControl slotfull 
Is there a disk in slot ? If is not specified
then display the status of all slots
Show the status of the drive. Returns -2 if drive is empty, -1 on error,
List all slots with media
List all slots without media
The usage syntax is missing one command, 'next' which as its name implies, it loads the next disc.
MediaChanger mount 0
The above command loads the disc from slot 0 into the drive
The above command unloads the disc back to its original slot
With this you will have command line control of your library independent of MCE. I am running and have tested this on several machines, including MCE, XP SP2 with modified drivers, and a clean XP SP2 with stock sbp2 and powerfil drivers (well updated via windows updates perhaps, but not manually forced by me).
What does this mean? Well if you are running say xLobby or whatver frontend (so long as they give you the ability), you can setup a external event for your offline media that will pass the slot defined in your database to this command line program (I recommend a wrapper script for handling errors) and have it unmount, mount whatever movie you are looking for. All *without* MCE as either the handler, or as the base OS.
It also means you can script rippers such as the author of the above program has done in his blog
. Or pure command line rippers as I have done using a combination of programs such as cdparanoia and the flac encoder.
And for the brave, you can even automate ripping DVD's via RipIt4Me using one of many windows automation languages (I am experimenting now, and it has made it to the next disc successfully as of this writing, all without any user interaction)