3D TV (2009-)
3D was supposed to be the next dimension in entertainment – we were promised that we'd be watching 3D films at home on our 3D TVs before settling down to take a call on our 3D phones. But while a large portion of TVs now include 3D as standard, when was the last time you donned your cumbersome specs to watch something on the UK's one 3D TV channel? TV manufacturers have moved onto 4K as the next big thing, the LG Optimus 3D and HTC Evo 3D represent the only attempts to get 3D phones into our pockets.
We said: "Regardless of the size and resolution of your TV, a more immersive experience is guaranteed by a technology that allows the terrifying girl from The Ring to crawl out of it and across your living room."
Microsoft Zune (2006)
Microsoft was a latecomer to the MP3 player party, launching its Zune player after Apple's iPod had already racked up 100m sales. Available in an rainbow of hues from pink to, er, brown, the first generation model struggled to gain market share against the Apple juggernaut. The final iteration, the Zune HD, was a perfectly fine music player, but by that time the damage was done – it never even made it to UK shores. But it lives on in some form, with the Zune HD interface lending its design style to Microsoft's Windows Phone OS.
We said: "Microsoft's Zune doesn’t ooze the iPod’s svelte sexiness, but inside that boxy casing beats a high tech heart with a state-of-the-art user interface, wireless networking, radio and a killer screen for movies. And it will only improve."
We greeted the arrival of Mflow in a state of high excitement; it was the social music service that promised to reward you – if your friends bought tracks based on your recommendations, you got a 20 per cent cut. Trouble was, rival service Spotify had 8m tracks versus Mflow's 1m – and a free-to-play model that encouraged users to sign up for its paid subscription offer. The plucky contender never stood a chance.
We said: "If you've been lucky enough to receive an invitation, Mflow will have sucked you in by now. If you haven't, don't worry – you'll be flowing soon enough."
Google Nexus Q (2012)
Google's spherical streamer promised to be a Death Star of delight, with gorgeous looks and the ability to stream music or video to your tellybox. But it was pulled after its performance failed to live up to its looks. Rumours swirled around it for a time – including chatter that the big G was planning to turn it into a games console – but in the meantime, Google launched the altogether more discreet Chromecast streaming stick.
We said: "The fact that it's been delayed while Google adds extra functionality merely makes the Nexus Q all the more mysterious and appealing."
Palm Pre (2009)
With its sleek curves, gorgeous OS and true multitasking, the Palm Pre seemed the likeliest contender to topple the iPhone from its perch. But it was plagued by delays, and by the time it emerged, the damage was done; its roster of apps was pitifully small compared to Apple, or even Android, and it never gained traction. Still, Palm's WebOS lives on – in a gorgeous-looking TV from LG.
We said: "It’s official: the iPhone is no longer the sexiest phone on the block. The much-hyped Palm Pre has finally slid into view, flaunting a sleeker design, a real Qwerty keyboard and hot new features like multi-tasking and wireless charging."
READ MORE: 15 gadgets that changed Stuff's world