Man, I hadn't even checked 'til you asked. 54.9 GB's! Love it, though. If you told me that I had to take all of my games off of my PC, but one... it'd be rough... but I think that FSX would probably be the one.
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"From our orbital vantage point, we observe an earth without borders, full of peace, beauty and magnificence, and we pray that humanity as a whole can imagine a borderless world as we see it, and strive to live as one in peace."
Astronaut William C. McCool RIP, January 29, 2003 - Space Shuttle Columbia