Call of Haste
Beast Mastery: 16
Wilderness Survival: 10 or so with whatever left in Prot Prayers for Rebirth.
Ever since I started running Beast Master builds on my Ranger I don't want to play anything else. It's very fun AND effective. The downside to this is build is that I sacrifice the pets defense for more damage. Not that big a deal though since pets don't suffer DP and you can raise and heal them right away. This build will change when I cap Enraged Lunge. I use a staff to give me more energy and it has 2 +defense mods on it.
Another build I use is for W/R, but since it is part Ranger I may as well post it here.
Axe Mastery: 14
Beast Mastery: 12
Tactics: 9 with whatever is left into Strength
Using a zealous axe I have no problems with energy as long as I keep swinging. Tigers Fury feeds Enraged Lunge which does +76 damage at 12 Beast Mastery. If your pet dies you wont be totally screwed as you can still use Tigers Fury and the axe skills. The weakness of this build is that you can't heal your pet well or else you'll quickly run out of energy. Another very fun and effective build.