Spam comes in waves, and it is difficult to keep track of what I've flagged and what's new (and unflagged). It would be nice with a little marker telling me what I've already flagged. The marker should appear in the question list, so I don't have to open the spam to see that I've already flagged it.
(I used the downvote button as a reminder for myself, since it turns blue after its been used. But in a recent thread here in meta, somebody said that using the downvote for this purpose is depreciated.)