SQLite4: The Design Of SQLite4. That sounds very interesting. Especially the first paragraph in "2.0 Overview", where he briefly emphasizes that SQLite3 will continue to be supported and both versions will remain available in parallel. And of course, the various changes that SQLite4 will have compared to the other version, such as the significantly better encapsulation of the engine in its own object. This makes it quite possible to have multiple databases open at the same time without much juggling. And what particularly pleases me: all calculations in Decimal Math and no longer double or float. Sorry, but double (and especially not float) has anything to do in a database, except perhaps as a data type for rare special cases. Also some other nice things in it, for example covering indexes and of course the standard available foreign key constraints.