After playing a couple of quick rounds of Civ4, I noticed that the latest patch had been released last month: version 1.61, which you can grab from the 2K Games site (maps can also be downloaded separately, Europe, US, Asia, Africa and South America). I see the patch includes a couple of new maps, plenty of multi-player fixes and some random changes to the gameplay like um…. ‘SDI cannot be built before the Manhattan Project’.
SDI? What was that again?
Patch discussion here. Should see if I have some time to install it.