Panasonic plasmas run Linux

SPOTTED: In the Setup menu of a Panasonic TH42PX7A (42 inch plasma), a menu item called "Software License". When you press OK, you get displayed a copy of the GPL v 2 and a URL where you can download the source code for the following things:

Linux kernel
Autofs (whatever that is)
glibc
mtd
mount
sash (a small self-contained shell, I think).

I don't know what proprietary software layer might be inside these tellys, or if this is maybe all there is (to facilitate firmware upgrades?) but I found it interesting.

The source code can be downloaded here: http://www.am-linux.jp/dl/EUIDTV5/