Christopher NullPCWorld

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Christopher Null is a veteran technology and business journalist. He contributes regularly to TechHive, PCWorld, and Wired, and operates the websites Drinkhacker and Film Racket. Disclosure: He also writes for Hewlett-Packad's marketing website TechBeacon.

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5 ooVoo problems even more annoying than the ads

The free video call service has its hangups, five of which we tackle here.

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Building a better sound bar: TV manufacturers take on speaker builders

Do speakers manufacturers build better sound bars than TV manufacturers? We pit three companies from each camp against each other.

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Denon DHT-S514 sound bar review: A disappointing effort from a noted speaker manufacturer

We've seen some fine audio products from Denon; unfortunately, this isn't one of them.

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Yamaha YAS-203 Sound Bar with Wireless Subwoofer review: Great sound, but light on features

This sound bar has a great price/performance ratio, but it lacks a number of important features.

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Polk Audio MagniFi Voice Optimizing Wireless Soundbar review: Why no HDMI?

Staying within a $400 budget shouldn't force you to sacrifice HDMI connectivity.

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Vizio S5451w-C2 54" 5.1 Sound Bar System review: A genuine 5.1-channel audio system

This sound bar delivers everything you big-screen TV needs, except for high-res audio support.

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Sharp HT-SB602 2.1 Channel Slim Sound Bar review: This humongous speaker delivers big value

This sound bar can fill a large room with great-sounding audio.

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Sony HT-CT770 2.1 Sound Bar w/Wireless Subwoofer review: This sleek speaker delivers the goods

Don't let its relatively small size foo you: This sound bar pumps out big sound

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The top 5 reasons why Google Hangouts never works

The right browser, the right app, the right plug-in...or the wrong one...we'll help you sort out the worst hangups of Hangouts.

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Skype fails: 5 of the worst problems and how to fix them

Admit it: You've cursed at Skype. We all have. These tips will save your breath--and maybe save your meeting.

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Guardzilla review: This dirt-cheap home-security camera has some growing to do

If you’re looking for basic protection for your small apartment or home, this wireless camera has only minor flaws.

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Free videoconferencing tools: 5 creative ways they can help you get things done

Skype, GoToMeeting, and their ilk need not sit idly between meetings. Use the services to collaborate, train employees and more.

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The top 14 hidden features in Windows, iOS, and Android

Betcha don’t know all these nifty tricks and time-saving tips to boost your productivity. Whichever OS you use, there's something here for you.

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ZoomPresence review: DIY telepresence system is a struggle to set up

Zoom's low-cost telepresence tool has some nice features, but lack of documentation makes installation a hassle, and you have to gather all the hardware yourself.