Straightening a tilted horizon is already fairly easy - you just rotate your photo until it's straight, although it does take some finessing to get the angle exactly right.
The Upright tool includes an auto-correction button along with three presets for level, horizontal and vertical corrections.
One is the classic "Oops, I didn't hold my camera straight so my photo is tilted." The other is a perspective issue that can be caused by the limits of your equipment, not poor technique: Unless you've got a pricey tilt-shift lens, taking building or cityscape shots often means your building lines aren't vertical, especially for a wide-angle shot. The new Upright tool within Lightroom's lens-correction panel deals with two problems you may encounter with a photograph.
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