Added: I have seen many junctional nevi that look like this.
So after spending several hours on the internet, there does seem to be a lot of similarity between the appearance of melanomas and junctional nevi(s?). As it is, I really hope you are right, Tom!
The spot on my foot is 7mm across at the widest, usually it has to be over 6mm before it's considered a melanoma (from what I've read). I'm hoping that this means that if it is a melanoma it is a small, young one. I go in on Aug. 24th to have it cut out. Hopefully the doc will let me bring a camera.
-Blast