The default forum search doesn't look in thread titles when searching, so go to Search > Advanced Search, enter your terms, and change the Search option from "Search Entire Post" to "Search Thread Titles Only".
I just did this with HBO in the search field and got the following hits:
HBO ON DEMAND?
HBO on Demand? NFLN on Demand?
HBO OnDemand ??
Why no HBO or Sho?
HBO?
I then searched other terms: "available" (no results); "master" (as in master list - no results) and then "list" - and got one hit:
Wasn't there a DoD channel list sticky?
That thread leads to this post
http://www.dbstalk.com/showpost.php?p=1440346&postcount=3
.. which isn't even in the On Demand forum and hasn't been updated in a while...