World of Goo is $1.99 for a limited time, I guess it's their birthday or something :P Great game if you don't already have it!
This is what it says on the description:
* 60% off for a limited time! Happy Birthday, World of Goo!!! *
PUDDLE THD is also on sale for only .99 cents, 75% off the regular price! It's a weekend sale, so it'll probably end Monday morning. Here's the link to that as well: