Just a quick point of clarification. WordPress 2.1.2 is a mandatory security upgrade for all users of 2.1 or 2.1.1
It doesn’t matter if you installed 2.1.1 on the first day it came out, well before the cracker modified the file on wordpress.org. It doesn’t matter if you upgraded to 2.1.1 using SVN. WordPress 2.1.2 has a security fix that 2.1.1 doesn’t have. And it has several fixes that 2.1 doesn’t have. So please, upgrade to 2.1.2 now.