There are three main resources for keeping up to date with pbrt:

The pbrt-announce mailing list

We will send infrequent announcements about bug fixes and new updates to this list. All pbrt users should subscribe. Go to the pbrt-announce subscription page to subscribe or to view the list archives.

pbrt Google group

This group can be subscribed to via email or it can be read online. It's a good resource, with many knowledgable pbrt users and developers and participating. It is relatively low-volume: usually just a few messages per week.

RSS feed

Finally, there is a pbrt RSS Feed . All significant announcements and updates are posted to this feed.

If you want to send private mail directly to the authors, send e-mail to authors@pbrt.org.