Danbooru-based image board with a specialization in high-quality images.
akaza_akari funami_yui namori seifuku toshinou_kyouko yoshikawa_chinatsu yuru_yuri

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nothing like a show that has the word yuri in the title - leaves out the guesswork ;)
It's only a manga so far, and a bit obscure as it runs in Yuri Hime S (which only publishes quarterly). It's a really cute and funny manga though, reminds me a lot of Ichigo Mashimaro, only with more yuri in it.