A Google search really didn't get me what I want, which is to find a site that compares a film's DVD release to it's Blu-Ray release. We all know that for the most part that the video & audio are superior on Blu-ray, but what about the extras? Blu-ray.com has very good reviews of what you're getting, but as the price of Blu-rays keep going down (and with recent sales, etc. they can be cheaper than DVDs), some of us are selling our DVD versions and buying the Blu-rays. I'd just like to make sure that I'm not losing some of the extra content that I want, or even in some cases, that I can live without.

There's a whole thread over in HD talk that lists all the movies where you're missing extras from the Blu.

DVDBeaver also compares extras.

I like HiDefDigest for this. In their reviews they have a "HD Extra section that tells what is exclusive to blu ray and they usually mention anything missing from the DVD in the reviews as well.

That's what I need. Thanks guys.

What about USA Blu ray vs. Internation Blu ray comparison site (for example, a USA Blu Ray of HEAT versus a UK Blu Ray of HEAT) ?

dvdcompare.net

Be aware that dvdcompare doesn't compare A/V quality.