Lftp is a file retrieving tool that supports FTP and HTTP protocols under both IPv4 and IPv6. Lftp has an amazing set of features, while preserving its interface as simple and easy as possible.
The main two advantages over other ftp clients are reliability and ability to perform tasks in background. It will reconnect and reget the file being transferred if the connection broke. You can start a transfer in background and continue browsing on the ftp site. It does this all in one process. When you have started background jobs and feel you are done, you can just exit lftp and it automatically moves to nohup mode and completes the transfers. It has also such nice features as reput and mirror. It can also download a file as soon as possible by using several connections at the same time.
Lftp can also be scriptable, it can be used to mirror sites, it lets you copy files among remote servers (even between FTP and HTTP). It has an extensive online help. It supports bookmarks, and connecting to several ftp/http sites at the same time.
This package also includes lftpget - A simple non-interactive tool for downloading files.
Several people suggested lftp over the recently featured ncftp.
More information on this package can be found on the Debian web site.
(If there is a package you would like to see featured here, go to the userinfo page and follow the directions there to submit your entry.)