I am preparing a report on Digital Video Recorders and I want to
compare the Graphic User Interface from the different machines.

I need jpegs, screen captures or other other ways of comparing the
user interface for each of the units.
I am not interested in the Generic TIVO or Replay TV interfaces as
they are widely known and available on the respective websites.

There is a lot of information about the actual functions of these
DVRss and several global review, and plenty of pictures on the outside
"box" but is it difficult to compare how the user interface actually
works without buying them all. Even the stores do not hook them all up
to monitors.

I would therefore like to have access to images of the main navigation
and sub menus for the following brands:
Sony
Pioneer
Philips
Samsung
Toshiba
Panasonic

Additional user feedback and comments with regards to how easy they
are to use, how pleasant they are etc would be helpful but the actual
screen captures are my main focus.

Here are some more specific product numbers if this helps: 
sony RDR-HX10 and DESR-7000/5000
Tochiba RD-X4
Pioneer DVR-710H-S
and so on.