Adobe’s Flash Player 10 adds built-in peer-to-peer support and is able to save files to local drives.
The first key Flash Player feature is a peer-to-peer (p2p) technology from a company they acquired called Amicima in 2006.
The second key feature is that Flash can now save files directly to your local hard disk.
These two new capabilities together make any type of p2p application trivial. Whether you are trying to roll your own LimeWire, or you have more honorable intentions such as implementing a server-less voice over IP (VOIP) application such as Skype, the new Flash Player will make these kinds of applications trivial.
I still hope Flash dies. And being able to write to disk? Can you just imagine the security problems that could exist with this?