My answer in January would have been closer to 1:1 but my first Kindle died and I have a shiny new Voyage that needs to be amortized now, so 2:1 hardware:books (2.9 now, 1.7 before).
$475 spent on hardware and accessories, $165 spent on ebooks.
Straying off topic so spoiler tagged...
Spoiler:
If I look at it ebooks+hardware vs projected paper book spending then ebooks, even with hardware, are way lower than paper books. (This helps me to justify getting the ereader I want rather than a cheaper one.
)
Pre-ereader I used to average about $200+ per year on books. Post-ereader I have spent ~$35/year on ebooks. Even including the hardware it is only $120/year. So, ebooks have saved me about 40% each year. (120/200 = 0.6) And that doesn't take into account the fact that my Voyage is only 3 months old, so I can reasonably expect it to last another 4+ years with no out of pocket expenses associated with it.
Looked at another way, the 5.3 years I have had my Kindle would have been worth $1060 in paper books and I have only spent $640 of that, so I have saved $420.
January's results would have been:
Paper: $1000
E-stuff: $400
So, $600 or 60% saved.