Sa-chan's seiyuu is widely admired as one of the best at... um, how to put it, voicing extreme/bonkers/flaming-fujoshi characters. She's the Jim Carrey of female seiyuus. Yuuki Aoi is sometimes considered her "successor."

Yes, the audio is why I prefer the anime version in Gintama's case.

Website/Blog: Yes. The project is moving forward.