Phil Libin’s guest post on TechCrunch is an eye-opener. The day the Mac App Store launched, the Mac leapt from bringing in about three per cent of new Evernote users to 52 per cent, and although this figure slid over the following days, it’s still high.

Libin thinks this proves desktop software remains viable, but that user experience is key, as is discoverability. One thing Apple got very right with iOS was in placing the App Store front and centre and encouraging users to buy software. The same’s now true on the Mac. One can only hope someone at Microsoft is paying attention, because a Windows equivalent would be fantastic (and potentially cut down on malware/virus issues if the store was properly curated).

Libin also reckons the experience has cemented his thoughts regarding users gravitating towards the best user experiences, justifying the company’s native-apps approach:

If Evernote’s desktop clients were written in Adobe AIR, I’d be worried right now. The immediate popularity of the Mac App Store, and the iPhone App Store before it, reinforces my belief that in a world of infinite software choice, people gravitate towards the products with the best overall user experience. It’s very hard for something developed in a cross-platform, lowest-common-denominator technology to provide as nice an experience as a similar native app.

As the CEO of a software company, I wish this weren’t true. I’d love to build one version of our App that could work everywhere. Instead, we develop separate native versions for Windows, Mac, Desktop Web, iOS, Android, BlackBerry, HP WebOS and (coming soon) Windows Phone 7. We do it because the results are better and, frankly, that’s all-important. We could probably save 70% of our development budget by switching to a single, cross-platform client, but we would probably lose 80% of our users. And we’d be shut out of most app stores and go back to worrying about distribution.