I've posted up the start of the annual list of Rio carnival blocos, part 1. There are so many blocos this year that I'm having to do this in several sessions. Sorry it's so late; he list was published late (mid Jan) and I was away for the first two weeks of February. Even just concentrating on the blocos in the south of the city, the list is longer than ever. You can access it here:
schedule of Rio carnival blocos 2011