you can also hit ctrl alt p to send the current view to photoshop and projection paint on it in photoshop. of course projection painting can have issues. i use this once in a while when i miss some of my photoshop brushes.
You could try : Category http://browse.deviantart.com/resources/tutorials/appreference/photoshop/?order=5 User collected tutorials http://photoshop-tutorials.deviantart.com/ Popular tutorial site http://www.tutorialized.com/tutorials/Photoshop/1 From google search http://photoshoptutorials.ws/