One of the most popular iPhone apps of all time is coming to the Blackberry. Urbanspoon -- which has recorded more than seven million downloads of its restaurant guide on the iPhone -- today introduced a free mobile app that works on most new versions of the Blackberry.

But don't try shaking your Blackberry to find a nearby restaurant. Most Blackberries -- unlike the iPhone -- do not have built-in accelerometers in which to detect motion. One of the unique and fun features of the Urbanspoon iPhone app has been the ability to shake the phone in order to be presented with highly-rated restaurants.That presented a bit of a challenge for the team at Urbanspoon as well as its Blackberry development partner: Toronto-based Xtreme Labs.

The compromise? Blackberry users can hit the space bar on their phones in order to activate the slot machine returns of restaurants. "It is not as cool as the shake, but it is really easy," said Urbanspoon co-founder Ethan Lowry. [TechCrunch -- which broke the new today --notes that the Blackberry Storm has an accelerometer and therefore allows shaking).

Urbanspoon -- which was gobbled up by IAC earlier this year --decided to focus on a Blackberry app in part because the company received numerous requests from users. But Lowry said he's recently become more interested in Android devices, and the small team at Urbanspoon now plans to begin focusing on that platform.

"Android is pretty ripe right now," he said.

And what about Windows Mobile?

Given that Urbanspoon is based in Seattle's Fremont neighborhood -- just a few miles from Microsoft's headquarters -- Lowry said they also get requests for an app based on Microsoft's mobile operating system. But, as a small company, he said they need to focus. And, while he would love to build an app for all of the Windows Mobile devices, he said WinMo pretty consistently "gets pushed down the list."

One of the challenges, he said, is the sheer number of devices available on Windows Mobile. That means more development horsepower and testing, something that Lowry and the rest of the crew remember somewhat hauntingly from their days working at Openwave.

Spending time testing the app on multiple devices is just not something that Lowry said he wants to spend his time on. In fact, that's a big reason why Urbanspoon decided to work with Xtreme Labs to co-develop the Blackberry app.

Lowry said the new app works on four different phone families from Blackberry, and trying to "maintain all of that is not hugely appealing."

Since the acquisition last April by Barry Diller's Internet powerhouse IAC, Urbanspoon has moved to new offices and started to roll out new services for restaurants. But, for the most part, Lowry said the new corporate parent has been "delightfully hands off."

"There's been nothing yet that they've said: 'No, you can't do that,'" Lowry said.

John Cook is co-founder of TechFlash. Follow on Twitter @johnhcook.