World of Goo only $4.99 this weekend on Steam

Steam is offering World of Goo as their weekend sale this week for only $4.99!
The game is incredibly fun. Simple to learn, hard to master. Get it. Play it. Love it.

Then go buy it for the Wii, where you can play multi-player co-op with the wii-motes... very enjoyable. :)

Thanks to Toxic for letting me know about this from his IM byline.