A chap by the name of Azy has posted some good WvW walkthroughs for the center map (eternal battlegrounds) and faction homemaps. The best I think was #4 for the center map that detailed what towers could hit what other towers/keeps/castle. Very useful for nailing down some early strategies for what to attack and how.
Center Map:
Part 1: http://www.youtube.com/watch?v=9dBobbe781g&feature=plcp
Part 2: http://www.youtube.com/watch?v=ljnl7WCjEuk
Part 3: http://www.youtube.com/watch?v=eS7r8rTmjaY
Part 4: http://www.youtube.com/watch?v=MjNTDcVfxoE
Faction Maps:
Map Overview: http://www.youtube.com/watch?v=WNzjXnBRv0E
Seige Overview: http://www.youtube.com/watch?v=abU5ZQCeEyQ&feature=relmfu
I encourage anyone new to WvW to check these out for a good introduction as well as anyone that wants to lead in WvW. Very good information for everyone.