At DEMO, a company called Cerego just launched a new adaptive learning system for English speakers who want to learn a new language: iKnow! Think Rosetta Stone, but online, and mashed up with a social network. Using

a specialized algorithm tailored to the individual learner, iKnow! can accelerate knowledge acquisition by having you review items at the optimum point in time – that moment right before you’re likely to forget it. At launch time, iKnow only supports English and Japanese, but four other languages will be added within the year.      Read more on Readwriteweb