Last week the Peer to Peer SDK was released. From the website: “The new Windows XP Peer-to-Peer SDK and the related Advanced Networking Pack for Windows XP will help developers create advanced networking applications. The SDK provides documentation and sample code while the Pack adds advanced networking support to the XP client, including enhanced IPv6 support, APIs for Peer-to-Peer name resolution, network graphing, grouping, and identity management. This SDK will help developers to create decentralized applications that harness the collective power of edge of the network PCs.“

Now call me biased, but I would of much rather seen this kit for Pocket PC and Smartphone. IMHO, phones and PDA’s are the true decentralized client.