There is a guy who is currently producing a "virtual floppy" device. I can't remember what it is called. We were talking about it here just a few days ago.
There is the HXC floppy. I'm not sure if that is what you are talking about though. Its kinda expensive... Might be cheaper to get a IDE/RAM expansion and just use whdload.
http://hxc2001.free.fr/floppy_drive_emulator/i ordered one but have not tried it yet.... looks cool
