The 1.3 version of World of Goo is the same version you can download through Impulse. The developer did not provide us with a version string so we labeled it 1.0. All of the changes and updates to the game you see listed on the site are already part of your download from Impulse.

Ah this is good to know, thanks!  You might want to fix the version number on the next release to match theirs as I'm sure I'm not going to be the only one wondering this.

We'll be updating the version info on Impulse in the morning 

Maybe someone forgot to update. As of this time, it still says 1.0 on a new/first install.

Also, if I do a search for 'world of goo' I get 0 hits. Is the search function broken? Or is it bizarely case sensitive or something? I know the phrase exists on these forums because I'm looking at it in this thread. But the search function finds nothing.

There were several critical updates that took place on Impulse this week. Things had to get shuffled around a bit. Thank you for noting this, we hope to have a fix out for it as soon as we can.