I do the same thing, and store them in iPhoto. I sometimes take screenshots of an entire page, if I like the layout of the overall thing, but I also frequently

I do the same thing, and store them in iPhoto. I sometimes take screenshots of an entire page, if I like the layout of the overall thing, but I also frequently just take screenshots of individual page elements: comments, a sidebar, a well done chart, etc. My iPhoto library is synced to my iPod Touch, so I always have that library of design elements with me.