Linux-insides – A series of posts about the Linux kernel (0xax.gitbooks.io)

Good stuff, so far as it goes. I do feel the need to point out, though, that if you want a rather more extensive set of posts about the kernel, you can find it nicely indexed at https://lwn.net/Kernel/Index/

Very nice!

Very nice. I've been planning to do a podcast series about this kind of stuff, but not necessarily limited to Linux.