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Star Trek has had so many computer and information-related technologies showcased in it over the years that it's very hard to tell where the science starts and the fiction ends.
While many of the IT advances in Star Trek haven't made it yet — such as true artificial intelligence, as featured in the Enterprise's shipboard computer system or Lieutenant Commander Data, many aspects of Trek IT have managed to filter their way into our daily lives.
Display technology is probably the biggie.
While you can hardly credit Star Trek for inventing the CRT, you can certainly see how the show has probably inspired generations of engineers to create LCD flat screens and HD widescreen wall-mounted displays, which were simply called "Viewers" or "Viewscreens" on the original show.
It should probably also be mentioned that the telepresence technology using video feeds for ship-to-ship communication first shown in 1966 is now commonplace, using technologies such as Skype, Google Hangout, and Apple FaceTime in addition to corporate video conferencing products such as Microsoft Lync, Citrix GotoMeeting, Cisco WebEx, and Cisco Jabber.
However, it should be noted that social norms have limited their actual adoption, and voice communication, while now more advanced than ever before with the advent of VoIP and digital signal processing, is still the way most people like to do things if they aren't texting or emailing.