I'm starting this post to gather in one location good books, DVDs and online materials on Taiwan's astonishingly diverse flora and fauna. Taiwan is said to hold 2.5% of the world's species and to have one of the highest concentrations of endemic species. Get out and learn some of them.
Flora of Taiwan: the six volume collection of books on Taiwanese flora (in English) is available for a free download from National Taiwan University. The first volume's introduction is one of the best overviews of Taiwan's natural environment (including geology and geography) I have seen.
Birds of East Asia, by Mark Brazil. Highly recommended as it contains all the species one can find in Taiwan (including migratory) in one book, in English. I'm waiting for Eslite to get their next shipment in as they've already sold out (as has Amazon.com).
This website by the Taiwan International Birding Association is fantastic. Birds are categorized as endemic species/sub-endemic and more. Lovely clear pics and summaries.
Various national park visitor centres are great sources for books and DVDs on local flora and fauna. Much of it is in Chinese but at least the latin names are there. Just do a Google search for the common English name.
I'll add more sources as I find them.