Online conversations with native speakers
What current systems are there for meeting and chatting (video/audio/text) with native speakers of a language?
How can we best arrange good matches for language partners to practise?
could a system based on interests and topics work?
-something like last.fm's method of putting together data of music plays, favourite artists and related artists to work out the similarity of users' tastes?
or, perhaps you could use a system where each user lists interests, background, and a 'would like to learn more about' section?