Internet based services, particularly asynchronous communication services, offer an environment suited to the rise of knowledge communities. Knowledge communities, or invisible colleges, have existing for a long time, but have not always had efficient ways of communication. Knowledge communities are heavily dynamic and are always changing in their composition and also in each member interests. The intersection of the interests of a given number of elements creates the environment for the rising of a community. Nevertheless, this community will benefit not by the intersection but by the union of knowledge of these elements. On the other hand, multiple overlapping communities are generated and one persons set of interests includes some intersection with the interests of several knowledge communities. These communities are rather fluid and dynamic and the old processes for scholarly communication dont seem to fairly represent these properties. Digital Libraries projects keep appearing ...