First, I want to thank everyone for their recommendations so far and I really appreciate it. I know I wasn't very specific in what I was looking for in a yuri title. The reason for that is that, outside of lolis and hentai, I'm open to trying out whatever is out there.
sextus the crazy said:
I knew someone was going to recommend Utena at some point. I've tried that series, but I had a hard time getting into it due to it's bizarrely heavy (and cryptic) amounts of symbolism. I did thought the main character was cool though.
I don't think Utena is the kind of show that demands you ~interpret~ it. That is, it's deep as a seven-layer cake and twice as delicious, but the through-line is pretty straightforward. You can try to puzzle out the show's obsession with monkeys if you want or take a stab at interpreting song lyrics if you're dumb, but in terms of symbolism the show is trying to be fun first and foremost. The real challenge of Utena, I think, is its structure. It's serialized like Sailor Moon or Kamen Rider - the kind of show you tune in to once a week rather than consume in a big batch.
Also, it's at its core about a romantic relationship between two girls but it's not very yuri at all. It's no Sakura Trick, anyway.
Uh, and but so anyway, skimming recommendations in this thread, I can give a slightly tentative thumbs-up to Saki, which takes what seems to be a very convoluted game whose rules I still do not understand in the least and manages to be fun anyway. The yuri is pretty milquetoast but...that's kinda par for the course. I'd also give a hard (but qualified) thumbs-down to Akuma no Riddle. Hard because I am rarely that un-entertained by an anime, but qualified because it's yuri written by a woman, which all yuri originally was. I guess that's not much of a qualification? Anyway, what the hell, maybe you'll like it. There's a guy I talked to for five minutes at a con who like it. Of course, he also like Black Bullet so, uh, I wouldn't call him a beacon of good taste, but that's at least one person who liked Akuma no Riddle.
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...there's...there's also, um, there's also one other show I can't not mention. You might...just maybe...want to take a glance at
Yuri Kuma Arashi. It's airing right now, and it's by the guy who made Utena, but it's...very yuri. Very, very yuri. Having not seen past the first episode of Sakura Trick...probably more yuri than Sakura Trick. But deep. Very very deep and symbolic. And it has bears.
I know at least two Escapist members have described it as possibly the worst anime they've ever seen, so it comes with that ringing endorsement, too.