Yahoo Group Archiver is a collection of scripts to interact with Yahoo Groups and download various sections of each group to your local workspace.
Currently the following scripts are being actively supported
sitecopy is for easily maintaining remote web sites. The program will upload files to the server which have changed locally, and delete files from the server which have been removed locally, to keep the remote site synchronized with the local site with a single command.
Plowshare is a command-line downloader and uploader for some file-sharing websites. Sites currently supported:
Megaupload: download (anonymous and free membership), upload (anonymous and free membership)
Rapidshare: download (anonymous), upload(anonymous and free zone)
2Shared: download and upload