Auto Backlink Generator 2010

  Improve you site with Get free backlinks from sites that will automatically link back to your site when you submit your url for analyzing. The site will display information related to your site and a backlink to your site will also be displayed.

This is completely legit. However, do not use every site in 1 day. That's not gonna get you anywhere except losing site rankings. Search engines want to see your site building backlinks to it naturally. There is nothing natural about 500 backlinks all showing up in 1 day.

1.) http://www.backlinkgenerator.net/ - 324 automatic backlinks for your sites

2.) http://marketingblogonline.com/autobacklinks/ - 104 automatic backlinks

Again, I would try to space out building your backlinks. Building backlinks too fast may hurt your sites rankings rather than improve it.