It's certainly not the first app Microsoft has crafted for the iPhone -- the Bing app has been alive and well for a while now, among others -- but you could argue that this is a pretty important one. Windows Live Messenger has just launched for iOS, and it's quite a bit more than your basic IM app with support for some manner of social service aggregation, media-rich status messages, Hotmail integration, and even built-in photo effects. Many folks will want an IM client that can span a bunch of services at once -- but if you're a Windows Live fanatic stuck in an iPhone world, this should be just what the doctor ordered. Let's hope the experience is just as good on Windows Phone 7, right?

[Thanks to everyone who sent this in]