These are information centers staffed by human experts who maintain directories based on their own knowledge and opinions; most queries receive responses within a couple of hours. Most require some form of registration, and many are fee-based, so be warned. See the Tech and Reference Sites listings for more advice and informational sites, most all of which are free.

5 Star Support - Free Computer Technical Support
www.5starsupport.com/

Abuzz
www.abuzz.com/

AllExperts
www.allexperts.com/

Amazing Techs (free answers to your queries, a forum community, and more)
www.amazingtechs.com/

AskJeeves AnswerPoint
answerpoint.ask.com/

AskMe (free general-interest site)
www.AskMeHelpDesk.com/

The Computer Consultant (network of experts who provide online help)
www.thecomputerconsultant.com/

Exp (fee-based service; lots of online advice files)
www.exp.com/

FreeAnswers (natural-language site that draws info from the knowledge bases at Microsoft, Intuit, Adobe, and Autodesk)
www.FreeAnswers.com/

Google Answers (get answers on any topic from volunteer researchers, for a small fee)
answers.google.com/answers/main

Guru.com (users pay a flat fee of $50 if they get help)
www.guru.com/

Keen.com (fee-based Q&A site that lets you talk anonymously to experts on the phone)
www.keen.com/

LookSmart Live
live.looksmart.com/

PC Pinpoint (tutorial-based, with live support on request)
www.pcpinpoint.com/

PC Support (a business-oriented advice and help portal; rather expensive membership required; now merged with Voyus and from the looks of it, has gone 100% corporate)
www.pcsupport.com/

PCQandA.com
www.pcqanda.com/