First post here, seems life a good forum and I'm glad to find others who like Heinlein as well.
I've got to go with, "The Moon Is A Harsh Mistress" as his best. Heinlein's amazing inventiveness in creating the creole language is very refreshing. When I first picked up the book I had to reread a page a couple of times to figure out what was being said, but, by the end I found myself thinking in the choppy sentences in which the characters speak. It is also a very good example of Heinlein's overall message of freedom and, of course, TANSTAAFL.
On a slightly different track I have to say that, "The Number of the Beast" is my least favorite of Heinlein's stories. It seems like he is constantly preaching about his concept of the total authority of a captain in space and, while the idea seems correct, it often feels like he is beating a dead horse. The character of Hilda in particular seems very whiny until she goes over to the extraordinary authority way of thought, at which point everyone is convinced of the captain's authority, but there are even more speeches about it.
Does anybody have any differing opinions on "Moon" or "Number of the Beats" anything that could help me to enjoy "Beat" more?