Frank White's idea is great! I quite like it. Although to be honest, I just don't have the cash to buy new books, as well as the fact that for novels, I am a poor poor reviewer. I would be far more interested in books like Tokyo Underground, Dogs and Demons, books on history, zen, yakuza, the prevalence of Otakuism here (I refer more to a lot of the Japanese men's tendencies to get extremely geeky about something), etc.
Some of Yukio Michael's suggested topics are also of interest. I would definitely at the very least read some of the topics, even if I didn't have anything to add. I am still feeling my way about a lot of Japanese issues, and I don't have an opinion I could call solid like I do with issues like religion and some parts of philosophy.