Something that I just found out that is nifty, but not (IMHO) nifty enough for lj_nifty. When you are on a reply page in LJ, you can view what the person calls their various icons by viewing the HTML alt tag. In many modern browsers, that will show up if you move your mouse over the picture for a short period of time.
The tag will show the LJ user and the text. For example, the tag for this entry should show rialtus:Asumed (F. Prefect).