Searching in variably connected P2P networks

Peer-to-Peer networks are gaining popularity through file-sharing communities. Most P2P networks demand a certain stability from it's nodes in order to function satisfactory. A variably connected P2P network, however, is a network where the connectivity of nodes might vary greatly over time. The nodes can be in different connection states, such as connected to the Internet or moving between networks as well as ad-hoc or offline operation