Some ideas are immortal. Take, for example, the humble Psion PDA. Although most people (rightly) thought it died in the early-2000’s, it’s since enjoyed an unlikely revival thanks to the efforts of British firm Planet Computers. Last year, the firm launched its Psion-inspired Gemini clamshell PDA (which we reviewed and liked), and is currently working on the follow-up, the Cosmo Communicator. During the madness of Mobile World Congress in Barcelona, TNW sat down with Planet Computers CEO Janko Mrsic-Flogel to look at an early prototype. There are several key differences between the Cosmo and the Gemini, perhaps the biggest being…

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