I'm guesstimating I'm in the 11-50 (though closer to the 11-15 mark). Heck I may even have less than that, but I rounded up just in case... I just got my reader last week and stocked up, but I've bought some pdfs in the past to read on my laptop. I'm including the dictionaries and such in my numbers.
Most of the ones I've bought are from lulu.com and fictionwise, though I have bought ones in the past from small independent sites too.
Even though I bought a handful of books, I've converted several word docs containing fanfiction and have been reading those the most, recently. Of course fanfiction was my main motivation for purchasing a dedicated reader in the first place. I also found a few of the pdfs I was planning to read don't convert so well, so I'm not sure when I'll get around to reading those...
