I have a list of questions that have been brewing in my head recently about HDTV. I have a Sony WS HD-Ready set and Im getting ready to purchase a DirecTv HD Reciever for my set. Anyways I know the questions have most likely been asked before and the like, but I haven't had much luck finding information on this kind of stuff. Any help is appreciated. First off, from what I've collected around here, there are 5 different formats. 480i, 480p, 720p, and 1080i. Why isn't there a progressive 1080 mode or an interlaced 720 mode? If a 1080i movie is broadcasted can the HDTV set perform an inverse 3:2 pulldown to convert (deinterlace) to 24fps without quality loss or are those options disabled during an HD stream? Are movies even broadcasted in 1080i or is that strictly for more televised programs? In other words, is 720p the only format for HD movies? also for audio .... Are all audio streams a fixed bitrate for Dolby Digital? Are all audio streams broadcasted in 5.1channels? Or are there as many channel combos on HD as there are on DVD? What about different frequency settings? Is HD in 44.1KHz or does it follow DVD's 48KHz standard? Are other audio formats available in the future or would formats such as DTS bring up issues with compatability? What about multiple audio tracks in the stream? This could help other audio formats such as DTS make appearances on HDTV. AND... Are all HDTV streams 16:9? If so, why are 4:3 HD sets on the market? (Without going over $1000) what is a good HD reciever for DirecTV for a Sony HD set? does the quality vary among them? I know its alot but again any help is appreciated!