Like I promised I would comment on something in you gallery. As far as I understood, you preferred to get comments on you calendar wallpapers, so I choose this one to comment on, because it doesnt have any comments yet.
Calendar-wallpapers, I must say, the idea is very nice. To make it practical as an wallpaper, I suggest you keep some space for icons, and for vista-users also some space on the right for the gadgets. You made it look very neat, I especially like the font.
When I was taking a closer look at the calendar part, I noticed something, from Saturday 25 you go to Tuesday 26.
The silhouettes you used are pretty cool, So guess it would be fair if I said something about all 12
January : Nice one, good to start of with.
February: Interesting, it seems to have some movement in it.
March: Very different from the other, personally I like the others better, because its a silhouette I miss the details a bit here.
April: Nice too, its a pretty dynamic pose.
May: A bit the same as March, although I do like this one better than the one from March, its especially the little pink behind the leg that lays down that saves it for me.
June: Nice because of the hair their seems to be movement in her pose, which makes it interesting.
July: I personally dont really like this one, its to static.
August: Different from the formers ones because you didnt use full body, this is one of my favourites now. It seems to have some more details than the others, especially those little chains between her legs are great!
September: a lot like august, maybe a bit to much, none or less, I still like it, because this one also has some more details.
October: Nice one, pretty dynamic pose.
November: Maybe a bit to much like August and September, except for that its really nice.
December: I love the hair and the movement in this one.
Just one more tip: I see you saved your images as .jpg its better to save it as .png, png is a bit bigger, but it will keep it all more smooth and clear.