You can mount your Box.Net account to easily upload/download files.
First, install davfs2:
Now, create the mount directory:
# apt-get install davfs2
# mkdir /media/box.net
Insert your username and password and it's done!
# mount -t davfs http://www.box.net/dav /media/box.net
You can also put your username/password in /etc/davfs2/secrets
So, mount will not ask for username/password.
echo "http://www.box.net/dav username password" >> /etc/davfs2/secrets
Also, Konqueror can access Box.Net directly using the WebDAV protocol:
(I think the protocol is just "dav://" in Nautilus)
If you want a Free Box.Net account,
Tested in Kubuntu Dapper Drake 6.06
More info and options: