Now you're talkin'
I'll start
http://www.videosift.com/video/Going-for-the-One-Yes
http://www.videosift.com/video/Gentle-Giant-Proclamation
http://www.videosift.com/video/Gentle-Giant-Octopus-Features
http://www.videosift.com/video/Jethro-Tull-Thick-as-a-Brick-Madison-Square-Garden
http://www.videosift.com/video/Skating-Away-Jethro-Tull-Live-on-UK-telly

Accept or reject at your discretion. Prog rockers walk the edge of weirdness. Sometimes they fall over the edge. Sometimes they hit the mark and when they do it's sweet.

Please check out the list and up vote some of the best music ever made.

Cool. Love the prog rock. Are you in to any of the contemporary stuff like Porcupine Tree. It might not fit your playlist criteria, but you might enjoy it regardless.
http://www.videosift.com/video/Porcupine-Tree-Russia-on-ice
http://www.videosift.com/video/Porcupine-Tree-Blackest-Eyes

http://www.videosift.com/video/Pink-Floyd-Pulse-Insanely-Perfect-Stage-Production

Oh, how about some Moody Blues?
http://www.videosift.com/video/The-Moody-Blues-Nights-in-White-Satin67-Great-Song

>> ^GreatBird:
Cool. Love the prog rock. Are you in to any of the contemporary stuff like Porcupine Tree. It might not fit your playlist criteria, but you might enjoy it regardless.
http://www.videosift.com/video/Porcupine-Tree-Russia-on-ice
http://www.videosift.com/video/Porcupine-Tree-Blackest-Eyes


I'm a mega-hardcore prog rock fan and love Porcupine Tree (seen them several times live). I just posted a new clip here if you're interested. I failed to get 10 votes for this before.

http://rocknroll.videosift.com/video/Porcupine-Tree-Making-of-Deadwing-1

Here are a few:

http://www.videosift.com/video/Rush-Live-YYZ-This-is-best-Rush-song-ever
http://www.videosift.com/video/Rush-Countdown
http://www.videosift.com/video/Genesis-Suppers-Ready-Live
http://www.videosift.com/video/Led-Zeppelin-In-My-Time-of-Dying
http://www.videosift.com/video/Led-Zeppelin-No-Quarter
http://www.videosift.com/video/Led-Zeppelin-Since-Ive-Been-Loving-You

and the two I just posted in honor of this list:

http://www.videosift.com/video/Yes-Close-to-the-Edge-Live
http://rocknroll.videosift.com/video/Porcupine-Tree-Making-of-Deadwing-1

Wikipedia on Progressive Rock
http://en.wikipedia.org/wiki/Progressive_rock

..good idea for a playlist, I like some of the progressive rock from that time..
http://www.progarchives.com
will be a great source of inspiration for the list..

This reminds me: me need to sift more progrock:)

Some sifts that come to my mind:
http://www.videosift.com/video/King-Crimson-Elephant-Talk
http://www.videosift.com/video/Focus-SylviaHocus-Pocus
http://www.videosift.com/video/Focus-Hocus-Pocus

*quality

I'll give you a few of mine later, if you want to add them to your list.

Awarding eric3579 with one star point for this contribution to Sift Talk - declared quality by kronosposeidon.

*quality

This is a great idea. I have always been a fan of progressive music, current and from yesteryear.
You rock bro!!!

=]

eric3579 has already been awarded a star point for this post - ignoring quality request by lurgee.