NOTE: Not maintained anymore, since I've stopped using NextPVR and with Plex.TV not really supporting plugins any more. If yours is still going thats great.
Plex Channel for viewing NextPVR content. Has the ability to stream live TV in any tuner supported by http://nextpvr.com (which is almost any BDA enabled tuner).
The Plex channel has it's own log in Plex Media Server\Logs\PMS Plugin Logs\com.plexapp.agents.nextpvr.log. This will normally be needed for any issues.
3 Options for viewing your channels in Plex: Live - Lists channels and the current show - requires a working EPG (in nextpvr) Channel List - Using a named channel group (defined in nextpvr) to list channels and ignoring the EPG. Useful for a Hauppauge Colossus. Channel Group List - lists all the channel groups and the channels for each. Whats New - New recordings
For the agent and scanner see: https://github.com/psyciknz/NPVRXML-Plex