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I really don't see DNA computing happening on a wide scale anytime in the next 20 or 30 years. It looks like it's being used for very specialized purposes, but can you play GTA Vice City on a DNA-powered computer?
IMHO, the next big innovation in computing will be synthetic diamond-based silicon wafers. Cheap to produce, and they won't melt down at the high speeds required to continue the application of Moore's Law. We may very well be running the Linux 5.0 kernel, Mac OS 14, or Windows Longhorn on diamond-based PCs in 2010 or 2012.