is D worth learning?

The D programming language... is it worth taking my time off my current projects to learn?

I've actually found one independenet game programmer who uses D -- source code included with this halfpipe shooter called Torus Trooper is written entirely in D.

But will this language ever really take off enough to warrant learning it?  There aren't even any books on it, and that may be a bit of a handicap in really getting mentally "into" it.

Half an hour? You must be a very fast reader. Most specs take longer than that to read (unless it's Scheme or Forth).

You might find this enlightening: http://www.norvig.com/21-days.html