AssetPreserver is a perpetual book on investing. The book's highlight is the critical list of due diligence questions to ask before investing in a particular asset class.
AssetPreserver:

Suppose you want to find the latest information on stable value funds. Searching the internet will bring up articles from the 1990s to the present. Many are not even dated so you are not sure of the relevance. Also, the time involved in sorting out the good from the bad can be inordinate. We do our best to make sure our evolving book does not go out of date.
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AssetPreserver’s perpetual book on investing enables the
reader to keep abreast of the latest research in various
financial instruments. Become armed with knowledge to manage
your own portfolio or have all the pertinent questions ready
if you still feel more comfortable with the services of a
financial advisor. In fact, a set of spreadsheets are
included that you can use as reference when making
investment choices. Plenty of investment examples and
unbiased opinions on investments and investment approaches
are offered with AssetPreserver.
There is also an excellent search
facility available.