Do you ever wonder why your blog is receiving comments in Russian cyrillic? Get the visitor maps plugin, and bookmark the stopforumspam.com site. You can enter the commentor’s email address, the home website they claim, even their IP address – which you can see in the visitor maps plugin. Every single one of these russian commentors shows up on the stopforumspam website, without exception.
These people, mostly from Prieli Latvia in my case, are trying to increase their SEO visibility by adding comments to our blogs. Don’t let them. I have my akismet spam filter set to mark all comments coming from the .ru domain as spam.
Akismet -
Personal Use API Keys
After installing the Akismet plug-in for WordPress or one of the third party Akismet implementations, you will need an API key to activate and use Akismet.
You can get a free API key by registering for a WordPress.com user account. The API key will be emailed to you after you register.
You can register with Akismet (wordpress.com actually) without having to sign up for a blog. They will email to you an API key (a short string of numbers and letters), you configure your Akismet plugin with this. It costs nothing, I have never received any email from Akismet nor have been bothered by them in any way.

