Just installed it.
First off, my Vista laptop wouldn't install the Windows telnet client, so I googled for an alternative and installed Putty.
Downloaded and installed the upgrade file - no problem.
Checked in Filezilla and could see the whole Hummy file system - as advertised. OK so far.
Started Putty pointed at 192.168.0.5 (manually set IP on my system). Connected.
At this point, being a linux numpty, I was a bit lost. Found a newby syntax guide here:
http://www.unixguide.net/linux/linuxshortcuts.shtml
Installed hmt and auto-protect, then virtual-disk and webif. Didn't need the syntax guide as I just copied the commands on this forum.
A few minutes later, all the Enc flags had been cleared on the Hummy, the virtual disk is available when copying a file via the OPT+ button and through FTP and the web interface is available when I point my browser at 192.168.0.5. After a quick look, I get the impression that anything else I want to add can be done through the browser. Cool.
That'll do for now. I'm impressed. I'll probably take a look at mediatomb tomorrow. The whole process was quite painless and the Hummy has not apparently suffered in any way. The only thing that didn't work smoothly was when Vista couldn't install Telnet!