(1)Clocks
(2)Money
(3)Painting
(4)Radio
(5)Television
(6)Movies
(7)Shows
(8)Robots
(9)Entertainment
(10)Fighting
(11)Saying 'hi' and 'good-bye'
(12)Counting
(13)the Alphabet
(14)School
(15)People
(16)Kids
(17)Friends
(18)Places
1, 11, 3 (how about we retitle it Art), 14, 16 (they did babies), 17, and 18 would be great.
2, it could go either toward leazzrning about money or crass capitalism.
4-7 could all be under 9 (though it would be great for Elmo to watch the TV channel)
13 would be great.
10, I don't think that would neccissarilly work in Elmo's World. It seems more like it should be a full on episode.
I could see counting quite well. Elmo could say,"Elmo wants to know more about counting" and have the Count drop in. The possibilities are endless.
Here are some more suggestions
Reading (there already is one for books, so we should have stuff about Magazines, newspapers, etc.)
Bathtime (A great Ernie E-mail in that idea)
Playtime
Holidays (even though we have Christmas time holidays, it would be great to see a short one about holidays in general)
Trash and Recycling (like with the Count in counting, Oscar could come in and discuss)
Colors (did they do that one?)
Shapes
Electricity