Amazon makes it much easier than most other sites to monitor its ebook categories. From the "Kindle Books" page in the Kindle Store (154,266 Results):
Quote:
Category
Kindle Books
Fiction (58,363)
Nonfiction (92,820)
Advice & How-to (8,458)
Arts & Entertainment (4,129)
Biographies & Memoirs (4,992)
Business & Investing (14,078)
Children's Chapter Books (3,510)
Computers & Internet (8,093)
Fantasy (2,702)
General (751)
History (10,419)
Humor (2,484)
Lifestyle & Home (4,864)
Literary Fiction (3,960)
Mystery & Thrillers (7,149)
Parenting & Families (2,355)
Politics & Current Events (5,860)
Reference (4,748)
Religion & Spirituality (8,658)
Romance (9,157)
Science (24,588)
Science Fiction (4,683)
Sports (1,398)
Travel (1,174)
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The catagories don't line up exactly, but FictionWise (for example) has 1,321 titles in its History category and 4,436 under Science Fiction. It is very clear that Amazon has far more non-fiction than other sites. This isn't a new observation of course. The point has been made before that Amazon has been very aggressive in getting non-fiction titles as ebooks. These may have been low hanging fruit, because they were probably already in electronic form - just lacking an ebook marketplace.
I'm sure the vast majority of the 92,820 non-fiction titles are "filler" to the trade, but it costs Amazon almost nothing to "stock" these ebooks and the profit margin is likely higher too (fewer discounts). You are far more likely to find a non-fiction title you are looking for in the Kindle store than in any other single site.