Just read it. Seconds before I saw this:P

First I thought this would be a more re-worked SDK few people would bother with, but the Steam Workshop feature seems neat.

Sounds awesome.

Looks lovely <3

Wow. Sounds awesome, I can't wait for it! Thanks for letting us know!

I tried to use the Source SDK, but I never really got into it... Bt this sounds amazing :D

This is glorious! Usually the content generated by users is much more challenging.

First person to recreate Googly's last maze down to every single room / item / portal, gets a free portal pack from me.

I'm glad to see that, can't wait ❤❤❤. Thanks for the heads up :)

Wiiiiiiiiiiiii!! ◕ ‿ ◕. Finally!!! ◕ ‿ ◕

nice addon valve : )

Can't wait for it to get released, thanks for the heads up!

Also, my birthday

omg so nice, thx for sharing

This is just...

Oh good, I tried that other thing Valve has to create maps and I deleted it after about 10 minutes. That isn't friendly or nice to work with.

AAAAAAAWWWWWWWWWWWW YEEEEEEEEEEEEEEEAAAAAAAAAAAAAA

There better be a filter to remove impossible/crap maps :P

Kaizo Portal?

video

Ooooh I like. Hopefully this means an easier way to install maps into the game rather than the old-fashioned drag-and-drop and console method.

I got to view this in action. Very intuitive and easy to use, though there was some obvious design limitations included.
For example, you can't make tiles less than 2x1 (portal size). Also, there is only the "clean" test chamber so far (no ruined or broken tiles, etc).
What really impressed me is the speed of choosing a chamber and playing it. The load time is only about as long as an elevator load takes in the single player. It uses the Steamworks website interface from the Steam Overlay. You simply choose a chamber and hit play.