High Tim,
I got the Panasonic TX36PD50C this week and yes it does buzz quietly at the back. I have read about this before and apparently it's quite common on 100HZ sets.
I have a small Geometery problem (straight lines curve in the corners) but I have an engineer coming on Thursday to try and correct this in the Service menu. Do you have this problem?
Also the Virtual Dolby is supposed to work when you receive a Dolby Signal. However, I have played various DVD's but can tell no difference in the sound when I switch the Dolby setting ON or OFF. Can you or anyone confirm if their set is the same.
Feel free to post any other issues as it's good to compare little niggles just for peace of mind.