"How to Do a Mail Merge to Email using Lotus Notes v2" - Gavin Bollard.
Gavin revised his original blog post, with more information and screenshots and based on release 1.0.1, done as a PPT presentation.
I have revised his document so that it is now the authoritative installation and usage guide for this project as of MailMerge release 1.1. This is available on the on the project's Overview and Documentation pages.