Are you an iTunes user? If so, by now you may be looking at iTunes 11, which Apple started rolling out yesterday. (Still running iTunes 10? You can get the update by clicking Help, Check for Updates.)
One thing you'll notice right away is the totally overhauled interface, which, just like with Windows 8, can take some getting used to.
Indeed, the big change is the disappearance of the sidebar, which is how most people navigated their libraries and playlists, the iTunes Store, and so on. Needless to say, iTunes 11 can seem disorienting without it.
Fortunately, there's an easy way to bring it back: just press Alt, Command S. That's actually a toggle, so you can press it again to hide the sidebar if you wish.
I find it interesting that software developers continually "improve" their products by hiding or removing features that users know and rely on (cough, Start Button, cough). Ostensibly this is to streamline the interface, but let's get real: it just causes confusion.
What I really wanted Apple to do was improve its search results for things like apps and songs, allowing me to filter them by, say, rating or release date. Instead we got side-scrolling search-result lists that, while similar to what you see on your iPhone or iPad, don't really help you find what you're looking for. Quite the opposite, in my humble opinion.
I'm sure some fanboys will take me to task for criticizing iTunes, saying I'm cranky about change. Maybe so, but I don't like being forced to learn a new interface when the old one was just fine, thank you. At least here you can restore it without having to install third-party software (cough, Windows 8, cough).
Users spot broken links, graphics bugs and other issues in iTunes 11
iPhone 6 rumour rollup for week ending 30 November
Apple selling 21in skinny iMac, taking 27in pre-orders for delivery in December
Apple updates iOS Remote app and Apple TV to bring iTunes 11 compatibility
Apple iTunes 11 available for download via Software Update