you could install a SSLVPN on your Home linux box and access it via a web browser..
take a look at sslexplorer for instance..
You can copy files using the web interface.
You could also download putty and run it on your work machine. putty is a stand alone executable and does not require installation. http://www.chiark.greenend.org.uk/~sgtatham/putty/
this will give you console access to your Linux machine.
pscp (putty scp client) will allow you to copy files between your machines through the SSH connection.