Give Backlinks To Your Readers - Use The Do Follow Plugin
A lot of bloggers like to comment on other blogs in order to increase backlinks. However, when you leave a comment on a WordPress or Blogger blog, a “no follow” tag is automatically inserted. A “no follow” tag makes links invalid with Google and Technorati and will not improve your ranking with them. Below is an example of html code for a link that “does follow” and is valid with Google and Technorati:
And this is the code with the “no follow” tag:
So if you want to give something back to your invaluable readers who comment on your posts, then give them a backlink by using a plugin called Do Follow which you can get from here. The Do Follow plugin removes the “nofollow” code from the comment links. It is easy to install - all you need to do is download the plugin’s zip file and upload it into your plugin folder and then activate it in your plugins administration area. So show a little link love and use the Do Follow Plugin! I have activated mine so feel free to comment 
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I’m not sure if my blog has just become more popular all of sudden or because I also have nofollow pluggin installed, but I seem to be getting more spam comments. These aren’t your average spam, they actually comment stuff related to the post and then talking about the product they are selling.
Jamie
Very useful tip. Thks. you could also register with blog directories such as www.blogarama.com
I have it installed, I get frustrated by people leaving comments using names like “Cheapest Car Insurance in the UK”.
What a great resource! Thanks for posting about it… I will have to see whether or not using this plugin causes lots of spam comments or not, however.