I just watched the first two episodes of Gokusen. My sister turned me on to the show. It’s probably old news for many people, but it’s fun. You can find English subtitled versions on fan sites and buy the Japanese DVDs on Amazon.co.jp. It’s a story about the granddaughter of a Yakuza clan who becomes a school teacher with a class of rowdy students. It’s sort of cliche new teacher vs. rowdy kids who turn into friends, but the Yakuza characters and philosophy are pretty interesting. The network of English language fan sites and the subtitlers is also fairly extensive.
Here is an English language fan site. You can google for torrents.