The other one that I've been revisiting since I found subtitled episodes, Onegai My Melody. And it would take way too long to go into detail about that one. Suffice it to say, it's cute, silly, and twisted. Seriously, it's like the people at Sanrio just went completely insane and thought up the craziest, goofiest things to do with a bunch of their characters. My Melody is an airhead on the level of Usagi from Sailor Moon, and Kuromi has a crush on a human character (which is just strange, but funny).
I don't want to talk too much about it, but there's just so many things that I could say about it. It rips off so many Anime cliches, themes, and storylines that you forget you're watching a cute rabbit in a pink hood who occasionally remembers that she actually has to save the world. Yeah, they're probably doomed.
On a side note, I did hear somewhere that a key character from the show (Usamimi Kamen) is going to be getting his own show next year. I won't tell you what 'Usamimi Kamen' means, but you can easily look that up on the internet. You'll probably get a laugh out of it.