We have just published a new briefing paper on distributed learning environments. The briefing provides a short overview into a number of models for extending functionality of existing VLEs.
The briefing paper came about directly as a result of our work over the past year into widgets, in our widget working group, and from the sessions Wilbert Kraan and I ran at the CETIS09 conference on "Composing you learning environments".
We'll be discussing the models in more detail at the Distributed Learning Environments meeting next week (4th March) and there will be some demos of a number of the models. There are still a few places left for the event (which is free to attend). More information, including a link to register is available from our event webpage.