I would love to see this. It would allow people to directly query their own inventory. It would allow a "living" document in Excel or even pull inventory live on a blog. Currently, I have to re-export my wishlist and inventory every couple of days to keep me speadsheets up to date, with a restful api, I can just update directly from Excel pulling the data. Thank you for all of your hardwork and putting up with all of our silly requests :)