This plugins allows the use of any website image (typical image formats, .jpg, .png) to be rendered on a map!
What this plugin does, in full description, allows the user with the proper permission (Operator or has the proper permission nodes) to get the map in hand, along with everyone else who has the same map ID (Default is 0, so I'll use that for an example) to see whatever the image is, rescaled to 128x128. Note that the images will NOT be in full color, as the map itself limits the colors given.
Official URL : http://dev.bukkit.org/server-mods/imgmap/
Servers using ImgMapServers: 2