I have developed a new experimental feature that allows the outputting of 
multiple [X]HTML files.
The feature effectively allows you to insert page breaks & specify the 
file-name & title of the new page.

The user simply adds lines of the form "%!output: <file-name> <page-title>" to 
their source file.
Whenever txt2tags encounters this it creates a new output file & handles 
writing headers, footers etc.
Subsequent output is directed to the new file.
It also correctly creates any table of contents so links point to the 
appropriate files.

I've also added support for "%!meta: <name> <content>" which adds 'meta' tags 
to the header of the current output file.

Combined these features allow the easy generation of help books for Mac OS X.  
[My primary focus.]

If there's any interest I can supply a patch.  The code is based on svn HEAD.
It also includes a few other small changes including the ability to specify a 
CSS class for each table instance.