Coming in first is Google Maps- This surprised me. I though for sure it would be just plain old Google but I guess when you think about it Google has done a great job of making their maps easy to import right into a website and it's unusual these days to find a site that doesn't have a Google Map on the contact us page.
In the number 6 position was Wordpress- Wordpress is one of the best FREE blog software tools.
Number 10 Youtube.com - Free video hosting with the ability to embed the videos onto a website (When you embed the videos you create a back link to Youtube)
Number 57 on the list - ezinearticles.com really stuck out in my mind as well. This site offers articles on a wide variety of content that webmasters can put into their website as long as they link back to ezinearticles.com. Apparently they do because the back links to this site are off the chart.
Check out the list for yourself. It's clear to me that if you really want to build a lot of great back links offering free tools or content is where it's at.
So I know what your thinking..."I'm a wedding photographer, how can I build a bunch of good back links I don't have anything to give away?" Let's think outside the box a bit here. How about a page on your site where you have a bunch of photos that anyone can download and use as long as they gave you credit in the form of a link below the photo(Free Wedding Stock Photos). Next time you shoot a wedding take some pictures of the cake, the buffet line, the decorations etc. Wouldn't you love some back links from a catering company, a cake decorating company a DJ??? All of these types of companies could benefit from some fee stock photos for their website and in return you could build some great links. You may not be in the top 100 but some good related back links will make a great deal of difference in your search engine rankings.
In the words of Jim Rohn: “Giving is better than receiving because giving starts the receiving process.”