Last week, Dan Pritchett from Logos emailed to suggest that I add links for books which are available in Logos' Libronix product. The guys at Logos sent over the links and now an icon appears next to any books which are available in Logos.
Here's a screen shot of the Genesis page:
And here's the popular "Best of Best Commentaries" page:
In the future, I'll continue to add links to stores and other means of accessing books when they become available.