Has anyone tried Valve's Steam App?

available on both iPhone and Android it lets you log into your Steam account, with its familiar Steam interface. You can access your account, look through your game library, purchase new games, see who is online from your friends list, and access you groups. About the only thing you can't do is actually play the PC/Mac games.

Is it worthwhile? I think so as can also launch steam chat and talk to friends currently logged into steam, which is great to arrange some multiplayer gaming later, to update your group announcements/alerts etc... and although I've not tried this yet, I'm guessing if your gaming PC were running, if you purchased a game in the app, it would start to download from the PC, so you could buy a new game whilst out and it would be downloaded and ready to play once you get home.

It's free for any Steam account holders so worth installing.