From the front page:
For over 20 years, the Journal of the Travellers' Aid Society has been the voice of Traveller and its fans. In February of 2000, Steve Jackson Games revived JTAS as an online magazine.
This book collects in one volume the very best articles published online in the year 2000, as picked by JTAS editor Loren Wiseman. There's material for GURPS Traveller, of course, but many articles can be used in any Traveller campaign – or any other science-fiction setting, for that matter.