I've been using XML sitemaps for about 1 year now, and it is a great piece of software. Thank you, folks.
The feature I would really like to see is a log of external links found at each crawl. My website is a target of numerous hack attempts, and a tool that crawls for injected spam links is a must. Right now I use a different script for this purpose, but it is a waste of resources to crawl the entire site of few thousands of pages twice, whereas XML sitemaps could extract this information at almost no extra cost.
Please consider including this feature