I filmed a short progressive video this evening, to see if I could burn it to dvd. The video was 29.97fps progressive. I have noticed in DVD architech pro that in project properties it gives an option of progressive but it is defaulted to no, and I cannot change it to yes. I burned the dvd, and it played fine on my dvd player. When I checked the properties of the DVD with MediaInfo the video was now interlaced. So I guess I can assume this is the procedure that DVD architect uses to burn Progressive video to DVD, and I won't experience any technical issues with burning progressive onto dvd in the future. Also, I am using the version of DVD architech Pro that was bundled with Sony Vegas, and not the stand alone copy.