Yes, but can I learn something from these books, that I have and use it in DX11?
Convert dx9 code to dx11 code is kind of difficult. Probably is better if you use only dx11 books.
I always find it somewhat funny (no offense) when people mention native X360 development as a plus point of DirectX 9, as there are probably not too many people on these boards who have had the chance to actually do native (non-XNA) X360 development.
Windows XP's life cycle will officially end in april 2014, so by the time the OP has learned DirectX and maybe has something playable which runs on XP the OS won't even be officially be supported anymore.
I never said that X360 support was a plus point, just telling the truth; dx9 supports x360
By the way, good to mention it. But quote me looked like I'm completely wrong. :/