Updated for 3.3 here.
For what it's worth, my main survival talent spec and main dps pet talent spec for 3.1 appear to be the most popular. I cover these in the post below. There are a few out-liers:
Some people don't like having the extra shot, Aimed Shot. I admit that it is a problem to have too many shots now with Black Arrow and not being able to macro Kill Shot to save space. It's pressure on our action keys. I'm dealing with that by folding BA and SrpS into a single button. I'll generally have to play around to find a duration I like. I really feel the need for Aimed Shot. While it pays to stay still, you get to move around a lot after you stand still. Multishot doesn't have as much to offer. In fact, I may move multishot if push comes to shove.
There are some variations on the ranks of Hunting Party. I've seen 1/3 and 3/3. The extra agility doesn't suck. I'm at 2/3. I found for my gear I was better off skimping one point there than somewhere else in the tree. I also didn't want to gimp my Replenishment by going 1/3.
Some people take up to five ranks of Improved Aspect of the Hawk. That's the spec of pre-3.1. Now you really need to be spending those points in Resourcefulness.