In an anticpated announcement on Monday (Feb 1st, 2010), Intel and Micron are expected to announce 25nm NAND is a reality.  Expected to start shipping in the 2nd half of 2010, the new memory will drive down costs per Gb to $0.50 - a significant drop from the current estimated $1.00/Gb seen at the current 34nm chip level.  

So how small is 25nm?  "If a human hair was a mile wide, the 25nm technology would equate to 21 inches."

That's quite small.  Read the full article from PCMag here.