This is why newbies get burnt on internet forums.
Anyway, quantum computers will be of little use for the things that we traditionally use digital computers to do.... Quantum computing allows you to do things (at least theoretically anyway) like computing very large prime numbers, or factoring an integer into it's constituant primes. That and performing multilpe opperations (billions in fact) simulataniously and almost instantaniously makes it very useful for scientific computing and cryptography, but it's not really going to impact the desktop computer market directly as far as I can see. Then again, every 5 years features that were only available on supercomputers seem to migrate to desktops, so I'll try not to be too dogmatic on that one.