When you hear about WebServer, the thing that first comes to your mind is a cluster of very powerful computers. But an application launched for the iPhone called the ServersMan@iPhone lets you use your iPhone as a webserver or say a data center.
It is developed by a Tokio-based company called FreeBit. After installing the application, computers on the web can access the iPhone for uploading or downloading files. The PC and the iPhone can connect directly if they are on the same network.
This software for using iPhone as a Webserver is currently only available in Japanese but English version will be coming soon.