So what is decentralization
The concept of decentralization is to remove the central structure of a network such that each peer can communicate as an equal to any other peer. When a peer (a) connects to a decentralized network it connects to another peer (b) to announce that it is live, b will then in turn announce to all peers it is connected to (c, d, e, f etc.) that a is alive, c, d, e, f etc repeating the pattern. Once a has announced that it is alive it can send a search request on to b, which in turn passes it on to c, d, e, f etc. If for example c has a copy of the file requested by a it transmits a reply to b which passes it back to a which can then open a direct connection to d and download the file.
Now this has both good and bad aspects lets break em down
Advantages of a decentralized architecture
They are more rugged, because a single point of failure is eliminated. They are also harder to shut down.
Disadvantages of a decentralized architecture
Searching a decentralized network is slower. You are not guaranteed to find a file even if it is on the network because it may be too far away for a search request to reach the peer which has it before the TTL expires.
I know many old timers on hubs etc wants Direct Connect remain as it is but times are changing networks have to adapt and restructure in order to survive now imagine a proxy network like the onion routing
http://en.wikipedia.org/wiki/Onion_routing
all anonymous downloading via proxy addresses thats one way to adapt i know that there are bittorent trackers set up in this manor
http://torrentfreak.com/bittorrent-hydr ... or-090725/
it isn't impossible to set a DHT nexus point behind this and make client use this just a matter of figuring out how
http://www.torproject.org/hidden-services.html.en
so i hope i given some ideas of how to make decentralization anonymous to the developers of these kind of applications.