Thanks for the post Laura.
I use the NLS maps a lot. They are fantastic for locating a small farmstead that you've never heard of where an ancestor was born back in 1732 or whatever. It really is an amazing resource and I can spend hours just browsing.
It is also possible to purchase prints of most of the maps, and they are great for framing and as a conversation piece. Strange as it may seem, we've had many parties where everyone was grouped around a map discussing it.