how long electronic storage media will last

new scientist, 30 January 2010,  (Now we know it / Tom Simonite and Michael Le Page)

Approximate longevity (subject to storage conditions)
8 years CD-R (cyanine and azo dyes), CD-RW, DVD-RW, DVD+RW <-- what most of us are using!
10 years Flash
12 years Digital tape
20 years Analogue tape
25 years Audio CD, DVD movie, DVD-R, DVD+R, CD-R (phthalocyanine, silver metal layer)
100 years CD-R (phthalocyanine dye, gold metal layer)
>100 years? paper

"Life after People",
100 years after humans, what will be left of our collective human knowledge... playboy magazines, reader digests,toilet paper...?