IIRC the Angel ending wasn't designed as a cliffhanger. They knew the show wasn't coming back for another season and that episode was supposed to be The End. It was a bittersweet ending where the world was essentially destroyed, but it was slightly hopeful because the main characters were still fighting. It's an ending I hated at the time but came to accept as a good ending later on after it had rattled around in my brain for a while.
A bad cliffhanger was the end of Farscape, where the cast and crew weren't given warning the show was going to be canceled until after the last episode had been filmed, so they were given no chance to intentionally end it. (Though they did come back and do the Peacekeeper Wars miniseries to wrap it up after the fact.)
Anyway, back to SGU... I called it that the disintegration of the soldier and the power fluctuations had the same source, and that it wouldn't have happened if Destiny hadn't been forced to stop to accept the incoming wormhole.
(Spoilers incoming... not gonna sblock them because there have been others in this thread already.)
I thought for sure that TJ was faking it until she was rolled over and we saw the blood, at which point I actually gasped out loud. Now the question is whether they're going to be able to save the baby or not. I wouldn't be surprised if it went either way. Having a baby on the ship would be a huge complication, but I'm not sure it's the type of complication that would be good for this genre. They did do it on LOST, however, and that seemed to go over well enough.
I loved the ending where the soldiers (there aren't too many military left, are there? I expected more than that) were being forced to their knees but Young was silently refusing to kneel as the power went out again.