Excellent work, Fred. I love you.
I echo other's comments about backup.
I only had a quick play, I will give it a proper go when I rebuilt, but I have a few comments:
It's not easy to see which Guide Service a Channel is subscribed to. You see the Channel Name, and the Service Name but not the Guide Service. Colours, maybe?
It's not immeadiately obvious which channel and Service you're about to link up. Maybe you could select the channel in the left hand side, then double click in the right hand side? If you go to merge a service to a channel that already has a service, why not just replace the service rather than having to un-merge it first?
It would be great to be able to right click a service and get a list of guide entries so you can see which is the best service for a channel.
Pressing keys on the keyboard doesn't jump to that letter in the list. It might be useful to jump to a channel number if you press number keys while the list is sorted numerically.
I'll say again - really, really, good work.