Features

Scans files on local file system (fast, but only finds files that physically exists)
Scans files on website (slower, but will also find dynamic generated files and links)
Set filter for file and directory names that will not be scanned.
Reads the last modification time and sets the change frequency accordingly.
You can specifiy the intial (fixed) priority of each page.
Create a sitemap.xml file and submit this url to google.
Set information to your needs (for each file): enable/disable a file, change last modification time, change frequency, priority
All settings (also for files) will be stored and are used for further runs
You can run this script with cron – run it on a regular basis automatically in the background
Compress the generated sitemap file with gzip
Store and send cookies (e.g. for sessions)
base tag support
generate sitemap files with different formats, e.g. HTML-based sitemaps
Use xslt to make the generated xml file human-readable

Features of phpSitemapNG 1.6

support for xml sitemap index files – a must for sites with more than 50.000 pages or a huge sitemap file with a size greater then 10 MB
plugin architecture to allow supporters to create their own plugin for their CMS or database driven applications
improved settings page

cron functionality / start phpSitemapNG from the command line
Add database as additional storage backend instead of the currently used file based
have input plugins for phpBB, wordpress and other cms/database driven software
add xsd check agains google xsd file

Please leave a comment, so that the feature-requests can be collected.