They just keep on coming, don't they? Here's another fan-made pony animation that's so amazingly well-done you'd be hard-pressed to believe that it's not a professional work: the pilot episode of Button's Adventures.
I'm really loving this, and the fact it's gonna be a whole mini-series eventually just makes it even better. :)
Kudos to everyone involved; JanAnimations (who also runs askthecrusaders), ShadyVox and EileMonty, as well as Berry_Sweet, BlenderPony and Tafkal. Y'all did an outstanding job!
(And it also seems that Button's Mom in particular has already become quite popular. :))