It allowed me to create a sitemap of my site without having to install any software, which is very convenient. And it's free! But it is a Java applet, which I couldn't get to run in Firefox on my Mac. It kept locking-up my browser. But I was able to run it fine in IE on Windows.
The interface is better than I expected it to be and the functionality is fairly comprehensive. For example, it allowed me to specify priorities and change frequencies for my pages. Whenever I need to create a sitemap, this is where I'll go.
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