debian unofficial key problems

["Frank Wilson" <fajwilson@gmail.com>]

I'm using the unofficial repository for some packages but I keep
getting the following error
whenever I run "aptitude update":

W: GPG error: http://ftp.debian-unofficial.org testing Release: The
following signatures couldn't be verified because the public key is
not available: NO_PUBKEY 394D199524C52AC3

I tried registering the public key for this repo locally, but the
above suggest to me this hasn't worked. (I've re-run "aptitude update"
several times since I added the key)

There is however an entry for debian-unofficial in my "apt-key list" output:

pub   1024D/FDB8D39A 2008-01-02 [expires: 2009-02-01]
uid                  Debian Unofficial Archive Automatic Signing Key
(2008) <ftpmaster@debian-unofficial.org>
sub   2048g/5A17668F 2008-01-02 [expires: 2009-02-01]

Which seems to correspond with this:

http://www.debian-unofficial.org/faq.html

Any idea what I am doing wrong?

Thanks,

Frank