Napster was not p2p architecture. P2p is by nature decentralized. Napster was client-server. It had a central point of attack because the Napster company owned all the servers through which the files passed.

This eDonkey thing looks like an intelligent p2p system (ie. p2p plus error checking).

To pick a nit, the server only provided an index. Once one system found another system that was sharing the file it wanted, it negotiated a direct connection. So it was a kind of p2p, because the actual work was done by two clients even though they could only find each other through the centralized server.