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I have recently been web-researching quantum computing.
Will we see these in our lifetimes (ever?) (The error correction issue, for example, seems intractable to me).
Just looking at the results from one website, I’d say it’s not that impossible:
http://arstechnica.com/journals/science.ars/2008/03/28/encoding-more-than-one-bit-in-a-photon
http://arstechnica.com/journals/science.ars/2008/10/28/scalable-quantum-computing-in-the-next-5-years
http://arstechnica.com/news.ars/post/20080729-finding-lost-qubits.html
http://arstechnica.com/news.ars/post/20080509-new-quantum-dot-logic-gates-a-step-towards-quantum-computers.html
http://arstechnica.com/news.ars/post/20080626-three-dimensional-qubits-on-the-way.html
http://arstechnica.com/news.ars/post/20080527-molecular-magnets-in-soap-bubbles-could-lead-to-quantum-ram.html
For a more technical overview of why it’s not as hard as it used to be, there’s a four-part series on self-correcting quantum computers:
http://scienceblogs.com/pontiff/2008/08/selfcorrecting_quantum_compute.php