Ar! There be spoilers here.

So, look, I'm a huge fan of Battlestar Galactica. Yeah, I know, geek alert. Still, it's a good show that has set a great mood and tension. So, I have this theory, and anyone who hasn't actually watched the show up until the most recent episode (The Final Cut, with Lucy Lawless using her real voice for a change) should stay away from the majority of this post. A lot of the information kind of depends on having seen the episodes in order to understand just what I'm talking about. Also, somewhere down the line, I'm probably going to be proved wrong, so you can't really hold that against me. This is just a theory that seems to meet up with a lot of what's been established in the show.
I also want to say that I put roughly the same argument up on Battlestar Wiki, but some ass deleted it because of a way he interpreted a line, something I'll deal with below.
Okay, ready?

Starbuck's a Cylon.
Yeah, it sounds crazy, but I've been putting this together for about a week and it seems like I might be right.
Okay, first, let's deal with background info, pre-Cylon Holocaust stuff. Starbuck met Zak Adama two years prior to the big attack. Now, the interesting thing there is that Six started her relationship with Baltar two years prior to the attack, and Boomer came aboard Galactica then, too. Two years before the big bang is roughly when the Cylon infiltrators first started working their mojo.
Okay, two years, big deal. Just a coincidence.
Maybe, but there's still this possibility: What if the Cylon plan for Starbuck was for her to initiate a relationship with Zak and then kill him so she could develop a bond with Commander Adama? Yeah, that's stretching a bit, but Zak's death really did create this bond between her and Adama that was stronger than Adama's relationship with Lee.
Okay, next, Starbuck seems to be more versatile than a Swiss Army Knife. In the episode You Can't Go Home Again, Starbuck is able to interface with the crashed Cylon raider and learn how to fly it in, what, maybe an hour? Okay, that's handy. But the fact that she's the only person who can figure it out, given that both Chief Tyrol and Lee Adama try, makes it an oddity. Starbuck is also highly proficient in anything she tries: card playing, flying, art (well, that's a case by case opinion), and is credited as "the best shot in the fleet." Seems like Starbuck could kick Buffy the Vampire Slayer's ass and not break a sweat.
Starbuck seems to be hated by any model of Six she encounters. There's the one in Baltar's head, who seemed quite jealous of her, in Kobol's Last Gleaming, Part I. Then there's the Six she encounters on Caprica in Kobol's Last Gleaming, Part II, who seems extremely aggressive toward Kara, wanting more, it seems, to just beat the hell out of her instead of killing her outright. This hatred seems to mimic the antagonistic relationship seen between Sixes and Boomers throughout the first season.
Starbuck's background that was established in Valley of Darkness and The Farm could be false memories implanted in her much like the background of Boomer's parents. This would also explain Conoy's almost intimate knowledge of Thrace's past in Flesh and Bone.
In The Farm, Starbuck's captured by the Cylons (although she does not know it until the end of the episode) and has a medical procedure performed on her. Simon, who turns out to be a Cylon, states that she has heathy ovaries and should attempt to have a child, which is "one of God's commandments," according to Six. The dialogue that Starbuck overhears concerning the removal of someone's ovaries never specifically mentions her by name, meaning that it is an assumption (albeit a rather good one) that her ovaries are to be removed. It is possible that someone else had fertile ovaries that would be put into Starbuck, who would then be released back to the Resistance in hopes that she would conceive a child like Boomer did. This would also explain why Starbuck was kept in a seperate room instead of becoming a breeder like the other women the Cylons captured. An argument could be made that Starbuck's removed eggs would be fertilized and then placed in infertile women in hopes of increasing the chances for conception, yet this still leaves open why she would have her ovaries removed completely and not be used as a breeder.
The bit that got this removed from Battlestar Wiki was that someone thought that a Cylon said that a Cylon would be used to knock Starbuck up. Look, that's not the case. In fact, Starbuck continually makes the assumption that she'd be raped by a Cylon, but other dialogue makes it seem as if she would be "set up with someone [she] liked." Not someone she would like, but that she did like. As Lee Adama is not a Cylon (his father obviously can vouch for Lee being around for more than two years), and Anders, the resistance leader on Caprica, is probably not a Cylon (he has prestige that makes it seem like he's been around longer than two years), it is more than likely that the two men who Starbuck "likes" are humans. So, how would it be a hybrid if everyone involved is a human. If you want to make the case that Baltar is a Cylon and Starbuck seems to like him, that's pretty iffy. His Cyloniness would explain some things, but it seems like Dr. Cottle's brain scan from Home, Part II, would show sillica pathways or whatever it is that Cylons use for their brains. It didn't. It showed a perfectly normal human brain.
So, anyway, I'm fairly certain that Starbuck's a Cylon. I put the case up here just to immortalize it in hopes that someday I'm proved right and can be the only person who saw it coming this far back (Yeah, I googled "Starbuck's a Cylon" and nothing came up, so I feel unique. Heh.).

Okay, spoilers over.
Unfortunately, I'm not sure what else to talk about. I've had the longest past 48 hours ever. Oy. It's not Kiefer Sutherland bad, but it's been a long haul. The problem is that most of it is my own fault. I could have slept for most of it, but I kept finding excuses (both good and bad) to stay awake.
Work is boring as hell, and there's the threat that my boss is supposed to come in today, which means that most stuff that I can get away with on Sundays is put on hold.
Oh, yeah, fucking republicans.
Well, that's all I'm going to post right now. I might do more later.