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Tango, a cross-platform mobile video calling startup, is today announcing its first expansion to a non-mobile platform: the Windows desktop. Sometime later this summer, the new PC software will debut, joining Android (phone and tablets) and iOS (iPhone, iPod Touch and iPad) as the third major platform launch for the company over the past nine months.

Pogoplug, from a company called Cloud Engines, is the name of the external USB drive that makes all your files available on the Internet. But now, Cloud Engines is moving into the software space with a new personal cloud product that comes hardware-free. Like the previous service, Pogoplug will let you stream your photo, video and music libraries from any computer connected to the Internet. But in this case, the libraries are stored on your own computer, not an external drive.

In a report released today, research firm Forrester attempts to define exactly what this "Post PC" era actually is. Foremost, it does not mean "absence of" PCs, but a whole new computing paradigm that will fold into existing technology and lead us to the computers of tomorrow.

Forrester came up with several guidelines and principles that will help manufacturers, developers and consumers navigate the technological waters that are stretching to the horizon. The research firm defines Post PC as, "a social and technological phenomenon in which computing experiences become ubiquitous, casual, intimate, and physical."

As a part of an experiment to really understand the value and the shortcomings of Microsoft's Windows Phone 7 platform, I recently made the HTC HD7 my primary device. The only exception to this is when I travel, when a mobile hotspot (such as is provided by my Nexus S) is a necessity. I don't know that this experiment can last much longer, however, because today's Windows Phone is simply not powerful enough for my day-to-day needs. When the "Mango" update (due this fall) is released, that may change.

In the meantime, I spent a little time playing around with the desktop software side of the Windows Phone experience, which is notably different depending on whether you're a Mac or PC person. Different, however, doesn't necessarily mean better or worse, I've found.

Wakoopa, a social network for software enthusiasts, has released a list of the most used applications of 2008 based on the usage of its members.

Wakoopa has not just collated the most popular Windows, Mac, and web applications, but it's also identified newcomers that showed prolific growth during 2008.