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.

OP you truly are an idiot. "Not practical for prototyping". Oh come off of it. Practicality for large systems is based on the programmers hardly the language and tools they use. Your knowledge of enterprise computing is obviously really limited if you think CPU bound processes are the big issue.