We’ve gone on and on about the merits of Flowboard, a web-based platform that lets users easily create  media-rich stories or presentations and publish them onto its servers. Until now, the service has only been available as an iOS app — but that’s about to change, as a Flowboard authoring app hits the Mac this spring.

Two dazzling innovations we’re pretty enthused about have melded, as Flowboard becomes one of the first apps to integrate Leap Motion into its Mac platform.

Flowboard. Flipboard. Look too similar? The people behind the Flipboard app certainly think so.

Brent Brookler, CEO of Treemo and creator of e-publishing iPad app Flowboard, says Flipboard has been threatening him with legal action since shortly after his app launched back in April, asking him to change the name of his app. Flipboard also wants the logo changed, which they say is also too similar to its own logo.

This is Flowboard‘s second significant update since the app’s April launch, and like the first, brings meaty upgrades. In this case, the big news is that the app now gives you the ability to embed YouTube clips and PDFs in your digital publication, and thankfully adds a way to undo you last action.

That statement up there in the headline, that Flowboard will be “the most important free app you download this month” — that’s kind of a bold thing to say.

But it’s not hyperbole; Flowboard’s publishing tools are super-easy to use, letting you easily create electronic portfolios and presentations — heck, even magazines and eBooks — and the finished products, published on Flowboard’s site, are just as easy to share and view.

And if you rarely download anything, well, this may be the most important free app you download all year.