IT Conversations Premium Editions and wget

The new premium editions of the IT Conversations shows are great, but I couldn't download them using wget, e.g.:

$ wget http://www.conversationsnetwork.org/audio/premium/username|email/ITC.Rails-TimBray-2007.05.19.mp3

--14:27:31--  http://www.conversationsnetwork.org/audio/premium/username
           => `username'
Resolving www.conversationsnetwork.org... 74.53.160.146
Connecting to www.conversationsnetwork.org|74.53.160.146|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
14:27:32 ERROR 404: Not Found.

The problem was caused by the | character separating the username and email address in the personalised URL. "URL encoding" this to "%7C" fixed the problem.