Do your NAS boxes support Torrent? Also, can I connect a fax/modem to the USB port to send/receive faxes directly from the NAS without keeping my computer on all the time? (http://zoom.com/products/dial_up_external_usb.html) A web management interface would work well for the faxes, just like torrents.
If not, you guys are going to miss out on a big market of paperless office equipment, and this is a perfect platform for it.
here are some product examples to confirm the market for these gadgets
one of them sells for around $79 and the other one for $135
http://slayo.com/digital-mini-fax-paperless-digital-fax-machine.html
http://www.gearlive.com/news/article/q307-digital-fax-away-paper