Just like the Web 2.0 has transformed the Web and the
way people use the Web, we believe that Web 2.0 has the poential
to transform research in technology-enhanced learnng.
We base this claim on two observations: rst, on the
wealth and variety of Web 2.0 services that are available
oday, and second, on the low complexity of exploiting the
functionality of the services by APIs, which allows to implement
functionality on top of these services.