checkout this thread: http://forums.digitalpoint.com/showthread.php?t=563755#post5276879 checkout this section of the forum:http://forums.digitalpoint.com/forumdisplay.php?f=65 and heres a good site: http://www.addurl.nu/ hope this helps!!!!!
I would try to build quality backlinks, not quanity. Find sites related to your content to exchange links with, at the end of your link building you should start using directories.
Ssandecki is right! Quality over Quanity http://www.avivadirectory.com/strongest-directories/ See if you can find anything relevant to your site here. Also, look into del.icio.us/ and furl.net