Ok, I couldn't resist this one...
It is an interesting list indeed and I agree with many of the items on the list, but I can't help but feel there are movies that are always going to be included because people think "they should be on there". That is also true for many of the ones I enjoy, but I guess I can help but like what I like.
I'll comment on a few of the ones I have seen and wish to comment on...
Don't Look Now - did genuinely shock me the first time I saw it, and I think it is still one of the few films I can say left me cold in a
good way.
Dawn of the Dead - This is a true modern classic, but it is not always the gorefest people expect it to be. Smart, and often slower than your average zombie, however it never lets up on tension, except when Romero wants you to get comfortable so he can shock you again. The reason this is so highly regarded because it is technically good, and has that which zombies crave - brains. The same can be said for
Night of the Living Dead - the scares may not be constant, or even that scary now - but they are both still thoughtful films that can't be ignored.
Suspiria- ok, I haven't seen this, but Argento leaves me cold (in a bad way). Like Kubrick, he is a very cold director and expects us to be scared by constantly hitting us over the head with gore. Not a entertaining experience at all (expecially Opera, which is hard to sit through).
The Evil Dead - well, what mroe can I say. Hail to the King, baby. Just the fact it was made for nothing, and the director is now helming Spider-man movies is a testament to how skilled these guys were. No budget, lots of enthusiasm, excellent scares. However, I do agree with 'Net - II is far superior because of the laughs, and is what fans have come to associate with ED movies.
Wicker Man - A recent convert to the cult of the Wicker Man, this may not be what everyone expects. Certainly makes you feel uneasy in parts, but also a beautiful film to watch. Classic ending is still powerful. "You did beaaaautifully!"
Shining - see Suspiria. Left me cold. I find Kubrick so cold and lifeless, with the exception of Dr. Strangelove and Paths of Glory. Didn't do it for me.
Exorcist - I go through phases with this. Certainly an important film. The corruption of innocence is always creepy (see Ringu). The orginal cut is still superior. The Version YOu've Never Seen (until you do) takes a lot of tension out I think...
Alien - I think this is actually the best of the series, despite my leanings towards Aliens. As Alien3 recognized, Alien was all about running around in the dark, which is the basis of good horror. I first saw this at 1am, and I don't think I slept after that.

I think this IS a horror movie, but also science fiction of the good kind as well. Whatever you call it, it does have genuine scares.
Ringu - Well, as I said - innoncence being currupted is genuinely creepy, and no-one can deny how creepy Sadako coming out of the TV is. However, also cold in parts - I think a prefect 'Ring' movie would be a combination between the Japanese and US versions.
Texas Chain saw Massacre - another one of those films people seem to have decided is a gorefest, but actually isn't. The scene with the slamming door left me chilled, and I am the proud owner of the entire TCM legacy (yes, even The Next Generation).
Psycho - I can't deny this horror movie classic its status, but Hitchcock films get most of their rep from certain scenes, rather than a dramatic whole. Most people remember the shower scene, and little else about Psycho. The Birds is another great example of this - slow for the first 35 minutes, then a whole bunch of memorable scenes. Still, the modern slasher owes a lot to this.
Halloween - well, my name says it all right? I'm ahuge fan, and I'm not alone. As 'Net points out, it started a whole new genre. Anchor Bay has about a million DVD release of this (and I have a couple). So what is it that makes this so good? The "Killercam" prowling the victims, Donald Pleasence, Jamie Lee Curtis, or the sheer cinematic quality that it - dare I use the cliche - Hitchcockian? How about all of them?
What else would I add for all time best horror films?
Well, more
Universal stuff I guess, simply because I'm watching them at the moment.
Silent Night Deadly Night is a personal fave, but not what you'd call scary.
Rosemary's Baby did nothing for me, but Polanski's
The Tenant is quite disturbing.
Obvious movies like
Nightmare on Elm Street and
Friday the 13th are left off, but I guess that they are more followers than trendsetters.
Finally, I don't think enough can be said for the impact
Scream has had on the modern slasher. Sure, it is very heavily influenced by Halloween, but it kickstarted the genre in much the same way that Halloween birthed in back in '78.