I don't use node on Windows personally, but a review of the mailing list shows there's certainly a demand, a lot of chatter, especially directly after releases.

Ryan seems to recognize Windows support is something a non-trivial portion of the community want, and is responding appropriately.

btw, Ryan briefly mentions node on Windows in this talk at about the 1:00 mark, and replies "Windows is very important" to an audience member: http://www.youtube.com/watch?v=jo_B4LTHi3I