I went through the Guest Blogging Formula. It is the best material (includes pdf, audio and video files and other bonuses) I've ever seen about Guest Blogging. Kevin provides valuable tips explaining how to easily find Blogs that accept Guest Posts and the benefits of backlinks from such Guest posts. The secret resource he mentions is heard by me for the first time in my 6 years experience as an Internet Marketer and it is a golden nugget for me. He also provides tip for finding authority sites...