[Jach]

I actually own Concrete Mathematics. Though I haven't read through it very seriously, what I have read has been excellent. (It was a great companion book for my Discrete Math course, whose book wasn't very good. (Discrete Mathematics and its Applications))

I might have heard of CTM before, but that's about it from this list.

[revolvingcur]

I hated using the Rosen book in undergrad. Concrete Mathematics would have been fine as the sole text for such a course.

[pmiller2]

The great thing about Concrete Mathematics is that you can use it for what it is: a really cool "grab bag" of techniques.