I've seen lots of questions asking the above, luckily for me I now have both
As I was so impressed with the 36ZP that I decided to buy the 32ZP for my kids playroom. Both are stunning sets, and size wise there's not a lot in it either, however the 36 definitely has that edge! So if you can afford the extra, get the extra 4" 
cheers
Andy
32" stand in front
http://img.photobucket.com/albums/0603/MADANDY1/Picture905.jpg
32" stand at the side
http://img.photobucket.com/albums/0603/MADANDY1/Picture906.jpg
36ZP with Panasonic SC-HT840
http://img.photobucket.com/albums/0603/MADANDY1/Picture907.jpg
32ZP with Panasonic SC-HT70
http://img.photobucket.com/albums/0603/MADANDY1/Picture908.jpg
cheers
Andy
32" stand in front
http://img.photobucket.com/albums/0603/MADANDY1/Picture905.jpg
32" stand at the side
http://img.photobucket.com/albums/0603/MADANDY1/Picture906.jpg
36ZP with Panasonic SC-HT840
http://img.photobucket.com/albums/0603/MADANDY1/Picture907.jpg
32ZP with Panasonic SC-HT70
http://img.photobucket.com/albums/0603/MADANDY1/Picture908.jpg