[Jeff Regan] "I'm not sure what "true 1080p" is"
True "p" is just that a signal that is captured and played back as progressive only, no mainstream "video" cameras I know of output 1080 content as anything other than PsF.
1080 by SMPTE default is PsF and only very rarely ever true P on playback (Red and Phantom being the rare exception).
an explanation of PsF is here:
http://forums.creativecow.net/readpost/193/875880
gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Check out
http://www.aja.com/kiprotour/
Inside look at the IoHD
http://library.creativecow.net/articles/adcock_gary/AJAIOHD.php