Virtual Atlas of the Moon
I very highly recommend the Virtual Atlas of the Moon; it's a free astronomy software.
I have it in my laptop PC (the one I usually use, these days, for the internet, too). Whenever I go to astronomy clubs, it's possible to show the Moon (in great details) as it is at any given moment.
For instance, it looks like it takes 6 hours for the terminator to cross Copernicus! Showing craters, what they are are, what they mean, etc...
If I'm observing the Moon through the telescope and a webcam, I can use the software to immediately recognize a crater (if it's an unfamiliar one).
Raoul