Unity3D - A* Algorithm Introduction
http://home.gamer.com.tw/creationDetail.php?sn=2500719
Unity3D - A* Algorithm - 01 Defined Node
http://home.gamer.com.tw/creationDetail.php?sn=2500784
Unity3D - A* Algorithm - 02 Node Sort
http://home.gamer.com.tw/creationDetail.php?sn=2500962
Unity3D - A* Algorithm - 03 Generate Node
http://home.gamer.com.tw/creationDetail.php?sn=2501015
Unity3D - A* Algorithm - 04 A* Algorithm Operation
http://home.gamer.com.tw/creationDetail.php?sn=2501093
Unity3D - A* Algorithm - 05 A* Algorithm Implementation
http://home.gamer.com.tw/creationDetail.php?sn=2501121
Unity3D - A* Algorithm - 06 Determine Obstacles
http://home.gamer.com.tw/creationDetail.php?sn=2501138
Unity3D - A* Algorithm - 07 Oblique optimization
http://home.gamer.com.tw/creationDetail.php?sn=2501180
Unity3D - A* Algorithm - 08 Line of sight
http://home.gamer.com.tw/creationDetail.php?sn=2504871
Good stuff!