Anyone still out there on this list? Looks like there hasn't been a post in nearly a year.
I just found a great little sudoku book and am working my way through it. Mastering Sudoku Week by Week. Its broken up into a bit on instruction on a particularly solving technique, then a puzzle or two that you need it for, then more instruction, etc. Up through the XWing and Swordfish and stuff like that.
Also..I realllly like the unusual sudoko..like the killer/sum suduko, the one with oddly shaped boxes, the X kind with a diagonal x in the middle. Anything. I've got another cool book Color Sudoko that has about every variation and is all in color. Well I guess they don't have the samurai sudoko but they have a ton of varieties in it. Who else likes the weird ones and if so what ones?