I like the Arthur swimming one, the magnifying glass one, the one with the kids "hatching" from the center circle, and the hot-air balloon one with the kids and Mr. Read.

I am a little disappointed that they replaced the original title cards with scenes from the episodes. In fact, I'm not sure, but I think they were inconsistent with it in much later seasons, switching between classic title cards and scenes. Correct me if I'm wrong.