Started with Agent of Change, then read Confict of Honors, Carp Diem, Pland B,, and I Dare in that order. Crystal Variation includes Crystal Soldier, Crystal Dragon and Balance of Trade. Dragon Variation includes Local Custom, Scouts Progress and Conflict of Honors. (It turned out to be less expensive to buy the triad rather than the first two seperately). Each book includes some extra material (dictionary, currency and time explanations, intro, notes, and afterward thoughts from the authors.
It is going to be a real trip reading these, because the books are two inches thick and will be difficult to maneuver around the lap cats. They are paperbacks, so I am hoping the binding stays glued. It looks like one was never read and the other is only slightly worn, but the pages are yellowed.
I also have Fledgling which starts a new sequence. I won't be reading that for a while. I will need to get Trade Secret and Mouse and Dragon to bring me up to that point, chronologically speaking.
I am terribly surprised that the neither my library nor the Phila. Free Library have any (well, maybe one if I remember correctly) of the Liaden Books. Amazon does not include any of the Liaden Univers books in the Lending Library, just the freebies, Agent of Change and Fledgling.