I've just reach 40 as a very casual player and I'm pretty sure I won't be able to ding 70 until WotLK. So, as a totally noob druid too, what would be a good lvling build (Feral)?
After getting up to Mangle (level 50) in Feral, go 11 points into Restoration to get Omen of Clarity at 61. Put the rest of your talent points into Feral and focus on DPS talents. Also, get King of the Jungle and spam Tiger's Fury every 30 seconds as a cat. Free energy ftw! Definitely get improved mangle. Rend and tear seems like a raiding talent, so I would avoid it in a pure leveling build (though a ~70%+ crit rate on ferocious bite is awesome). You might also toss a couple of points into Master Shapeshifter or Naturalist in Restoration.