Independence Day 2! Wait, that hasn't come out yet, my bad.
Getting back on track, my top 5 are:
1: Waterworld
2: The Postman (Loved that movie, don't really know why)
3: Tank Girl
4: Mad Max
5: The Road

I have been watching Post Apocalyptic films for decades and publishing books on the subject as well. Check out my list if you would like to see hundreds of PA titles I have rated
http://www.imdb.com/list/1-8CVkqixCk/
.
My top three would probably be:

1. The Roadwarrior
2. Threads
3. Logan's Run
4. The Book of Eli
5. The Postman
6. The Road

I felt that Omega Man was actually the worst adaptation of the novel. Vincent Price's Last Man on Earth frequently makes direct quotes and I Am Legend just really 'felt right' after reading so many other Matheson stories. I take that back, there are a couple of weird martial arts versions I have seen on TV that were obvious rip-offs that included misplaced quotes that were worse than Omega Man. All of that said Omega Man was still the best of all of these films without a doubt, just not the best adaptation.

On the Beach
The World, the Flesh, and the Devil
The Omega Man (I personally think it's the best "adaption" of the novel)
The Day the World Ended (1955)
Logan's Run
I have to admit I have a soft spot for Waterworld and the Postman, especially the Postman.
Conquer your fear, and I promise you, you will conquer death.

Thank you delesc!
"The world is indeed comic, but the joke is on mankind" ~H.P. Lovecraft

An impressive list. You have good tastes.

Here are my top 10 Post-Apocalypse movies.

1. The Time Machine (1960)
2. The Last Man on Earth (1964)
3. Planet of the Apes (1969)
4. Fantastic Planet (1973)
5. Zardoz (1974)
6. Wizards (1977)
7. Naussicaa of the Valley of the Wind (1984)
8. Mad Max 2 (1981)
9. Children of Men (2006)
10. The Road (2009)
    Honorable mention goes to 12 Monkeys. Only a small portion of the film actually shows the earth after the virus, but it was well done, and it's a great film anyway.
    "The world is indeed comic, but the joke is on mankind" ~H.P. Lovecraft

Brazil, really? You bash the OT and then claim a forgotten Monty Python reel? A Scanner Darkly isn't even close to OT. Read the topic next time since Zombies and Dystopians aren't interesting to the OT.
Children of Men is one of my favorites also

There is a thing called: opinion. Ever heard of it?

Was this meant as a joke? You just posted 3 of the worst movies in the genre. The road was about homeless people walking through mud forever with a non ending, book of eli was up there with resident evil in terms of extreme cheesiness and the postman is waterworld levels of failure.
Children of men is my #1 by far, other than that i'd go for Blade runner, 28 days later, Thunderdome, A scanner darkly, Brazil.

a recent release:
Colony w/Laurence Fishburne

You forgot mad max series
And check out damnation alley
Also tank girl

Yeah Threads might actually be the best of the films the OT described.

Threads
To God There Is No Zero. I Still Exist.

I respectfully disagree. It was alright IMO.

"The Road " is excellent. Little hard to watch cause of the implied cannibalism thing, but a great movie anyway!

I'll add one more:
Things to Come (1936)

I will add "Time Of The Wolf" to my watchlist. Thanks

A recent favorite of mine is "Time of the Wolf"
"A Boy and His Dog" is also quite good

Yes certainly The Day After

The Day After (1983) truly a great movie.