Sorry it took so long, but I had to get back to my home computer and refresh my memory on my specs. I bought the computer 2.5 years ago as I was going back to grad school, so gaming specs weren't so much in mind at the time (silly me!). So, here are my specs (at least the most relevant ones--if I'm missing something, let me know):
IBM Thinkpad R51, Intel Centrino Pentium M. 1.6 Ghz, 512 MB RAM. Video is ATI Mobility Radeon 7500.
I couldn't actually run Civ4 all that well until after the first patch (at least not if I wanted to see everything) 'cause of the blacked out sections. It got better, but I wasn't able to see animals until now and the wonder videos were all herky-jerky but they are much smoother now (or at least the first couple were smoother--I have yet to finish a game). My hard drive is almost maxed out (~30GB--I've got less than 10% left, after uninstalling Civ3), so I clearly need to find myself either a portable hard drive for music/videos or a cheap media laptop (maybe a refurb) for Civ so I can keep this thing for school, as I can't afford a whole nice new system at this point. But I'll get by, somehow!