If you don’t have a favicon Google could be giving you one great big reason to get one. They recently started testing using favicons in the search results. This was first mentioned on January 25 on Search Engine Roundtable. It was later confirmed on the Google Groups Help.
When I tried it I could not get it to work, so I cannot confirm or deny that this is true. Below is the screenshot that was available from Search Engine Roundtable to give you an idea of what to look out for.
I read about this over at Search Engine Land.
If you are lucky enough to see take a screenshot and leave a comment with a link to the image so we can all take a look.
If this does not motivate you to get a favicon, I don’t know what will.