I don't know if you guys know this or not, but in this OXM it says 2k4 will support 720p HDTV. This is the only 2004 NFL title that will support this I believe too. =P~
Yeah, it seems that is the trend with Sega Sports games now. WSB 2k3 is the same way. Hopefully NHL2k4 will be 720p as well.
Almost twice the lines of resolution. Just makes it look way sharper. 480p has 480 lines running across your screen, and 720p has 720 lines going across. The more lines, the better the picture.