I recently was pleased to discover that on the L4 Library screen you can right-click the header row and select, among other things, Publication Date for display. This should be great to see when a library search term yields a number of books in your library. Quickly knowing which books were published in, say, 1880, 1950, or 2008 is good information to aid in deciding which to use. But the date appears to be meaningless; for example the Pulpit Commentary is 2004, and Hodge's Systematic Theology is 1997. I'm guessing this is the date Logos obtained it. So this becomes a feature suggestion -- It would be nice if Publication Date could show the actual copyright date of the original book (or its last revision).