iSendr lets you send files to anyone with an internet connection via an on demand p2p direct connection for free! Your file goes straight from you to its destination-- no server space required.
PipeBytes is a free online service which let you to share files with your friends. This service is web-based, which means no plugin/software installation required. Exchange files of any size with anyone you want.
xFiles lets you exchange big files with anyone via an on demand p2p direct connection for free! Your file goes straight from your pc to the destination pc without uploading to a server.