If you are looking for true HD porn movies, then take a look at Zero Tolerance on Demand  They have over 600 full length high def movies online, and you can download or stream them ALL as a member.  The movies feature top porn stars like Jenna Haze, Amy Ried, Courtney Cummz, and many other top stars.  The site is nicely organized and categorized so you can find what you want fast.  You can preview the entire site before you join - the members area is exactly the same as the preview site, except with the download links enabled.  This is by far the biggest collection on full HD porn movies I have seen and especially with the full access $4 trial, it is an insane deal.
 

Full DVD's in Full HD
Download full DVDs - including bonus footage and behind the scenes.  Download full length videos in full 1080p HD, or stream online in Flash.  Top pornstars, uncensored hardcore, and stunning video quality make ZTOD the ultimate site for high defintion porn.