Don't worry though, it's not a massive step away from the industry. While these applications can be used for things other than creating games, they're all still pretty closely tied.
...and it's not just that this software is used to make games (or games-related products) that makes them such a great fit for Steam. Many also use Steamworks features, so you can expect easy installation and automatic updating, as well as the ability to save work to your Steam Cloud space, making your files available regardless of what computer you're working on.
These were meant to launch on September 5th, but Valve time struck again. As compensation (or an added incentive), Steam is offering 10% off the regular price of Software for one week only, so get in quick!
I like video games and music and cups of tea and noodles and beagles and colour-cycling LEDs.
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Jimmy the Geek