More recently, we met him twice at the ToonTown Train Station, in that little circular sidewalk area near the smoking section. Both times, it was around 11:30/11:45ish (once on a Thursday, once on a Friday). That is a very sporatically-used character meeting spot.
We saw Rabbit in this same spot as well. We saw him there on Monday, 12/05/05 around 2:00PM. We were on the train when about a dozen characters came out a back door by the circular sidewalk area. We asked one of the character helpers if they come to that spot often. The helper said that they do not come to that area very often.
The bummer part of the story was that we did not meet Rabbit at this time. He was the only one that we did not meet and then the characters all went back behind closed doors. It was our first day of our week long stay and we figured to see him again, but we didn't.