I watch HFDL data periodically. It's been a while. It's a kick to see data from an aircraft half way around the world. Now that I finally have a computer that's able to run all the programs I want to run at the same time, I need to play around with it again. I believe it integrates with Planeplotter, which I just set up.
Speaking of data, I have to add that it's a kick to get a virtual radar receiver (ADS-B receiver). I've loved watching real time data from my SBS-3 as I listen to the radio traffic. Viewing the data whether it be HFDL, ACARS ,or ADS-B/Mode-s adds a whole new dimension to air traffic monitoring.