A key place to start
Conole and Alevizou’s outstanding recent literature review on Web 2.0 approaches to learning, produced for the Higher Education Academy UK), is probably as good a place to start as any when seeking the very best of literature relevant to this broad topic:
Conole, G and Alevizou, P. 2010. A literature review of the use of Web 2.0 tools in Higher Education . HEA.
Google, particularly Google Scholar, continues to remind us that, unless analytical and highly annotated, there is little point in producing bibliograhies anymore.
Some interesting reading, however
The following lists 50 of the articles that are steadily accumulating in the delicious collection associated with LINK (at http://www.delicious.com/knownetlearn
