Interesting... I would seriously consider blocking Russia & China for sure due to past spam/abuse/bots. Some of my site content is of interest outside North America, although NA is the main market.
Is there an easy way for a non-server guy to block two countries? Is it as simple as using the .htaccess file? Right now I run a forum and block individual IPs after they spam. And I've set a crawl delay in the robots.txt for the bots that never send me traffic, to at least slow them down a lot. I'm going to rethink that as I will probably just block all the known useless bots.