Originally Posted by zirpkatze
any tips on litter training would be greatly appreciated.
The most important thing you need to know about living with rabbits is that www.rabbit.org
is the best reference in the world for everything
bunny related. Here's their litter training FAQ: http://www.rabbit.org/faq/sections/litter.html
But to sum up, litter training a bunny is surprisingly easy. They usually pick a favorite spot to go, so often it's just a matter of letting them pick a spot, then putting a litter box down on that spot. Then lure them into the box with treats. Once they come to associate sitting in the litter box with getting treats, it'll be their favorite place in the world, and they'll want to "mark" it regularly to keep others away, so that'll just become their place to pee. And that's really all there is.
If they happen to pick a spot on the floor where you don't want to put a litter box, clean that spot thoroughly with vinegar, to get rid of the scent of the pee. Just cleaning it so you can't smell it isn't enough. You need to cover up the subtle scent that they can smell and we can't, which is why you need to use vinegar. Then try to lure them to a different spot next time.
One other thing: Bunnies often back up just before peeing. If the edge of the litter box is too low, their butt can hang over the edge, and they can pee on the floor outside the box, even though they're sitting in the box. Most pet stores these days carry "corner" boxes, where two sides are much higher than the other two, which are perfect for dealing with this problem. It should be pretty obvious from watching your bunny which corner of the box they usually pee in, so you'll know which way to align the box, if it's not actually in the corner of a room.