I know it's been up for ages, but I still wanted to add a shout about the latest bi-/multilingualism carnival, most ably hosted by Solnushka at Verbosity. There's some great stuff on there, for example on myths and making up languages (which my kids do too, see Quadrilingual and more).
My personal favourite though is the post on bilingual literacy at Mummy do that. This topic is starting to excercise me, as I think it is going to make a lot of difference to what our children will be able to do with their languages when they are adults. So I will be writing more about this in the future, but for now, why not have a look at what else there is at the carnival.