[Lazy_Perfectionist]

Uhmm.. off the top of my head...
RapidShare.de
megaupload.com

If it's less than 2.5 megabytes, you can use xs.to as well. PNG is a lossless compressed format you can use if the two map formats don't work. They describe the acceptable formats at the bottom of the page.

If 2.5 megabytes is too much, you'll need to zip it and upload to one of those two sites. As well, I think this forum has a fairly large attachment size. You may be able to attach it here.