Thanks the the lovely PB we now have Maps uploaded for your viewing pleasure!
http://minemap.tehforum.co.uk/
Pete: I ran the output file (11.7MB) through PNGCrush and it came down to an amazing 11.0MB - not really sure what options I should be playing with in PNGCrush to get the best results. If anyone has experience with it and feels like giving me a bunch of command line switches to use I'll try them on future Maps.