Follow Me is generating a fair few 404 errors, because of the plugin's generated HTML code looking like this:
src="http://tomsbiketrip.com/wp-content/plugins/follow-me/images/<br /> twitter.png" border="0" alt="<br /> Twitter" />
The line-breaks are deliberate. They shouldn't be there. Some browsers are requesting this URL as a result:
Giving a 404 error.
Those URL entities are the codes for line-feed and carriage-return. Poor code - please fix this!