Here's a great testimony about how Logos contributed to the writing of a major New Testament commentary, all the while overcoming ready access to a modern theological research library.
Gary Shogren is Professor of New Testament at Seminario ESEPA, San José, Costa Rica and author of the recently released commentary on 1 & 2 Thessalonians in the Zondervan Evangelical Exegetical series. In his blog post, he explains how the first task of writing a commentary is engaging the text and then interacting with the thoughts of others.
It's a neat article that goes behind the scenes to explain how a commentary was produced.