I'm a huge fan of Tsukiuta / Tsukipro! I don't follow everything besides the music CDs (and 5 anime seasons but it requires some bg), but they do a lot through Twitter, drama CD's and stage plays. It's also like a 2.5D project so the characters are 2D but age normally in real time.
Also Vocaloid song projects do some cool things as well but those ......
