I have mentioned before that I have used Nisus Writer for years (my doctoral thesis and book were written in it). Although I still use Word for collaborative projects, to make sure comments can be read, etc. I love NWP, use it, and support it whenever I can. (It has support for right to left languages that only Mellel can compete with, yet is far more robust than Mellel.) TUAW has noted the update that was released last week.
In the latest skirmish in the endless battle for word processor supremacy, Nisus Writer Pro has been updated to version 1.1. The new features include enhanced commenting, a Mail Merge capability that uses the Mac OS X Address Book or csv files for a record source, a vastly improved Table of Contents generator, indexing, bookmarks for navigation or cross-references, an enhanced Nisus Macro Language (take that, Microsoft!), and the ability to embed Perl scripts. There are even more features, so visit the Nisus site for details.
Nisus does a great job of listening to their customers, and it appears that Nisus Writer Pro 1.1 has included many of the features requested by users of the initial release. The download version of Nisus Writer Pro 1.1 is $79 to new users, $49 for owners of Nisus Writer Express and free to owners of Nisus Writer Pro 1.0. A 15-day free trial download is available for this Universal Binary app (Mac OS X 10.4 or better required).