It's not finding it in the repos because it isn't there. hellanzb is not in the standard Archlinux repositories (Plugapps) or ipkg (openpogo).

Head over to plugapps and put in a package request.

Man, it would be great if you can post a walkthrough, or package build. I was just looking how to add a newsreader to my dockstar. Looks like you could add the pkgbuild in the 'user submitted' builds! http://plugapps.com/forum/viewforum.php?f=4

ctjameson- Thanks for working on this. I doubt I could help (as I have limited linux experience), but if I can help, don't hesitate to ask.

One thing I noticed (if you're using sabnzbd) is you need to make sure winrar is installed. I'm sure theres an option to disable 'auto-extract', but just throwing it out there...