I raised a SAS/Graph question on another forum some time back and the author (Rob Allison) dropped me a note offering some examples he created. I hope Cynthia won't mind my adding this off topic link, but I found his material to be so useful I think it should be shared more widely.
Look at his example for SUGI 26 attendance on the page
http://robslink.com/SAS/democd1/aaaindex.htm. He annotates four lines of pop-up legend for each data point and produces a very workable map.
You might also want to look at
http://robslink.com/SAS/democd15/zoom.htm which was an example he showed me when I made a comment about the famous Charles Joseph Minard graphic portraying Napoleons advance and retreat on Russia in 1812.