Thanks to all for the tips. The wording of my original question was probably too vague. I could either put in FIXMEs (this is what I actually meant by placeholders) for the designated screenshotter, or try to do the screenshots as I go. It would definitely be best if one person does all of the screenshots, especially since what I know about the Gimp at the moment probably wouldn't fill the 500x375 rectangle, but I'm not sure if we have a screenshotter to do the work. I've seen custom FIXME tags cause odd-looking results in the output from a Docbook, so it's useful to know that FIXMEs should be written with <remark>.
