Still my favourites as well :)
The Yip Yip Martians meet a telephone (blue Martian puppeteered by Jim Henson)
Grover's Health Minute - Teeth
Grover the Waiter - Big Hamburger
Born to Add
The Beetles, Letter B
Most memorable animations:
Me and My M.
The Ladybugs' Picnic
Number 12 from the Pinball counting song, sung by The Pointer Sisters
I could go surfing You tube all day looking for more but I'll leave it at that!