This is one of those tools that no one really talks about because it is free and is something you only set up once. I consider it to be one of the building blocks for blog commenting and if you are doing any kind of blog commenting (even casually) you must have Gravatar set up.

This post is sponsored by 2 wonderful blogging tools (they are mine so I can say that)
http://commenthut.com/ – Search WordPress only – works on pc and mac – Just $9
http://commenthutpro.com/ – Searches multiple blog platforms – for PC and Mac -$37

Watch the video and if you have not set up gravatar yet go and do it now.

Oh and you can use gravatar to show author info as well on many themes and with some plugins.