1. When there was a good fifteen minutes to go during the jubilation of finding Earth, I was immediately thinking, This can't be good. What I was expecting was for the enemy cylons to show up on their tails and for the finale to stop in the midst of a really bad battle over the planet. Initially my reaction to the planet being, well, ugly, was negative, but it really was probably the least predicted outcome: for the promised land to look even less promising than New Caprica. I'm just super-excited that so many questions were answered because that means so many more are going to be opened up in the second half of the season.
2. A Roslin/Adama/Thrace family!shipper's evaluation of this episode: I was kinda bummed that we didn't get any cuddly between Lee and Kara throughout the whole episode, since I'm not convinced the shocking elation of her being alive should be wearing off for quite some time, but those two were just so Starbuck and Apollo when they were talking in Bill's office at the beginning that I was a little pacified. Loved the scene near the end when Laura was kinda taking care of Bill like a wife, and then she had a talk with Lee in which she clearly remembered how awesome he is. As for the aforementioned jubilation, I'm kinda mopey that there were no hugs between Kara and Lee when they found Earth, but I realized it was a lot more fitting of Starbuck's character to have her in the memorial corridor paying her respects to the people that didn't make it.
Also, OMG, if I ever have children I want a son JUST LIKE LELAND ADAMA. Not that I'm going to need my children to drag my drunken ass off the floor after I've found out my BFF is a cylon, but that scene pwned any other awkwardly affectionate scene that has happened thus far between the Adamas. LET ME HANDLE IT. FOREHEAD KISSES. I LOVE YOU, LEE.
3. As for the four revealing themselves to the fleet: I take back every little inch of irritation I've had with Tigh lately for doing such a balsy thing to make up for his cowardice from before; especially since he's apparently been aware of his cowardice, I'm very forgiving of the man right now. I have some personal disappointment over Chief not being the one to be noble and come clean, as he seems to be taking some nihilist approach to cylon self-identity. But damn, the look on Sam's face when he was arrested right in front of Kara totally broke my heart. He also looked so frakking sad when he came up next to her in the hallway at the end. God, Anders, you kill me with guilt for my OTP :( :(
4. The theory I've heard that seems to hold the most water right now is the whole idea that you have to die to get to Earth, that it's a kind of heaven. At this point my only semblance of a theory is that the lame cylons (+ Boomer of course) will show up, there will be war between those cylons and the alliance of humans/cylons (over I guess nothing really important) and those that die will experience Earth as a significantly prettier place. I totally called it on rebel cylons fighting alongside humans to destruct the cylon's capacity to resurrect by the second ep. of this season, but I'm all washed out of any of my own theories for the rest of the episodes, especially now that the possibility of cylons not only coexisting peacefully with humans but most likely reproducing with them is a possibility that has rapidly solidified in the past couple episodes.
5. I bet Katee Sackhoff absolutely loved this episode, that tragedy hound :)