So I travel a TON for work. The Pin Map has really helped me to explore different parts of different cities and getting to play a lot of different machines in some cool places. I think it would be great to add a place to a wishlist of sorts from the Pin Map; so when one is in that area, they can see which places they have tagged to visit.
My last visit to Seattle I really wanted to visit Shorty's, but since that town is packed full of so many neat pinball places, I couldn't find it on the map until I returned home. There could also be a spot to check places that you have been and can attach to your profile. Just a thought for my pinside wishlist.