I have a CPView with some children (CPImageView's, CPTextField's, etc) and I would like to know if it's possible to take an screenshot of that parent view. Thanks
no, not out of the box... remember you're still in the browser.
Now, depending on how bad you want this... A while back someone wrote a generic DOM parser than rendered out the current DOM on to a canvas. It was pretty immature though.
Luckily Cappuccino generally uses just some absolutely positioned divs, and background colors/images. Which means if you wanted to write your own parser, it might not be as hard as it sounds.