Lack of Heinlein love?

I was reading through a lot of these "favorite book" lists and threads, and I have noticed a supreme LACK of any mentions of Robert Heinlein, one of my favorite authors. Given the large number of apparent sci-fi fans around here, is there something I'm missing?
I mean, I like Asimov and P. K. Dick, Clarke (I particularly like CHildhood's End) etc, but they often get multiple mentions, yet no Heinlein.

What gives?