Windows Vista: The original Windows failure. Microsoft is the only company with the honor of making the list twice. (Microsoft)
Windows 8: Global PC shipments fell by 13.9 percent in the first quarter of 2013, and according to analyst firm IDC , Windows 8 could very well be the reason after a slew of controversial decisions such as killing the Start button. (AP PHOTO/DAMIAN DOVARGANES)
Palm Foleo: What was the point of this Linux-powered pseudo-laptop? Nobody really knows. (Palm)
Qwikster: Netflix wanted to spinoff its DVD-by-mail business by arbitrarily renaming it. The idea was confusing and quickly abandoned. (Netflix)
Apple Maps: Apple's attempt to cut Google out of the coveted map space ended up making the generally unflappable company look quite foolish.
Airtime: Despite the celebrity endorsements, Sean Parker's Chatroulette clone failed to launch. (Airtime)
Google Buzz: Google's first real attempt at a social networking service was a bust and highly criticized. (Google)
Groupon IPO: After being worth $13 billion soon after its much hyped IPO, Groupon is now worth only $4.17 billion. (Groupon)
BlackBerry PlayBook: BlackBerry's attempt at hopping on the iPad bandwagon was a miserable failure. (REUTERS/MARK BLINCH)
New MySpace: Just as irrelevant as the old one. (MySpace)
Facebook Email: Why would you ever use Facebook's email service? We have no idea. (Facebook)