> > "Flash/data EEPROM retention :  > 40 years"
> 
> Doh! I must have looked at that a thousand times by now... Thanks!
> 
> That said, do you know of any more indepth discussion of this?

There are quite a few AN papers on EEPROMs eg,

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2048

175kB

http://ww1.microchip.com/downloads/en/AppNotes/01019A.pdf

130kB

http://ww1.microchip.com/downloads/en/AppNotes/00537.pdf

60kB

http://ww1.microchip.com/downloads/en/AppNotes/00562.pdf

64kB

http://ww1.microchip.com/downloads/en/AppNotes/00572.pdf

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