I love tree pose, too! I also really like bow, and I like wheel because I feel like a hot shot doing it :p My favorite is probably reclining hero though because I find it very relaxing.

Up dog. I also love seated twists. My favorite, though is the one where you lie down, knees pulled up and to the side so that you're doing a spinal twist. I'm not sure of the name as everyone calls it something different, but it is my absolute favorite. My back pops (in a good way) when I do it.

warrior or upward dog feels the best..

I like the crocodile when you are lying twisted on the floor and breath down into your belly.

Sphinx and forward fold.

Extended puppy pose - It's a cross between child's pose and downward facing dog. Good stretch for my back.