Ask and you shall receive. According to Gabe Newell, co-founder of Valve, you all wanted an app to message your Steam buddies, check out screenshots for games and check up on sales, so here you have it.
On Android and on iOS. And it's free, so long as your iOS device is a 3rd-gen iPod Touch or at least an iPhone 3GS running iOS 4 or later and your Android device has software 2.1 and up.
That, and you need to be invited to the mobile beta for the app in order to access it (I tried, but couldn't get i; anyone got an invite?).
The big deal is that you'll be able to spend as much money as you want on those crazy Steam game sales from your smartphone or tablet. Prepare to see an uptick in impulse buys!
In some ways, it's similar to the My Xbox App that Microsoft launched on iOS late last year. You won't be playing full-blown Steam games (someday, we hope!), but it's the best app to keep you connected to your Steam account while you're on the go.
So far, the only service that seems to let you play full PC games on your Android device seems to be OnLive. Apple has yet to approve the iOS version of OnLive's streaming PC game rental service.
Baby steps. I imagine in five to ten years, we'll be playing PC games on our smartphones and tablets and we'll look back at these primitive days and chuckle.
UPDATE: The Steam app is now available for all. Yay!