I have heard a lot of people say that links from sites that have a related theme to yours are worth a lot.Here is my question.How the hell is google supposed to know if a site has a similar theme.if your linking from a directory you can normally put up a little discription of your site, and any other text in the page is going to be from similar sites so wouldnt that mean that directory links are probably worth as much as a link from a similarly themed site???