It had passed my notice until just now, but thanks to the handiness of a Hulu queue, I just learned that Stargate: Atlantis, Stargate: Universe and the original, Stargate: SG-1 are back streaming on Hulu. It appears all of the episodes are available with HuluPlus (paid), while there are only a few of each streaming for free. If history is any guide, they'll probably step through them a week or a month at a time (I don't recall which) and right now, because the first few of each are what's streaming for free, it's a great time to add them to your queue.
Also, if anyone is interested in marathoning one of the shows over the holiday television break, the usual free trial of Hulu is one week, but if you use this link, it'll get you (and me) two.
I've never been all the way through Atlantis, so that's what I'm going to do.