Apple has released iOS 4.1 for the iPhone and iPod touch. The update includes proximity sensor and iPhone 3G performance fixes. The update also includes Apple’s new multi-player game network, Game Center, and the ability to take high dynamic range (HDR) photos.

I’ve been using iOS 4.1 on my iPhone 3GS since last week and it’s a fantastic update. I wish I could write about the HDR photos feature, this is what has made me most excited about 4.1, but unfortunately it is an iPhone 4-only feature.

For a more complete list of changes Mark Gurman has written a detailed overview of iOS 4.1.

iOS 4.1 is available as a free update to all iPhone and iPod touch owners (excluding first-generation models), simply connect your device and click “Check for Update” in iTunes.