The walls are closing in on link building methods. I just signed up for article base and all links are now no-follow. The only places to write meaniful content with a good link back to your site are my own blogs, ezinearticles, hub and squidoo. Social bookmarks and free directories have run their course and Google cannot give to much credit much longer because it is easily spammable. Anyone come across do follow sites that are link-juicy?
There are still plenty of good backlink sources - there are lists of 100s if not thousands of article directory sites, some of whom still pass decent link juice. Same with press release sites, prweb being the main one that comes to mind.
Are you only looking for free sources? Plenty of good article sites left, but they cost e.g. Press Release sites.
Always looking for new methods of building links... looking forward to see if what people come up with.
People are still finding new places to get links. Paul and Angela's method is getting quite popular. I am doing more and more guest posts nowadays.