CS.... I definitely meant to include .ru, but a vBulletin site of mine gets a lot of hacking attempts from .de. .cn & .tw probably top the list. Those are probably the top 4 sources of scumbag hackers and spammers.

When I put my site on a dedicated server, I'm going to use GeoIP to block about 90% of the planet. For D7, I'm more concerned with spammers than hackers. Spammers will definitely love D7's 'Sites' module.