It doesn't seem to break anything, but on my site it made all the pages off the main menu (e.g. What's Cool etc.) have no title, name, or keywords META tags at all. I see that it did this on your site too but you added meta tags to add.html and you don't use the other links (although the pages resolve if you know the URL).

Going off of the "Browse" page, it does add the category name to the title, keywords, & description. The URL remains the same (I know there was no claim that it could change the URL).

Although it doesn't seem to be 100% perfect, I'd say it's an improvement for both SEO and bookmarking purposes. If there's a way to make the meta data appear on those other pages, that would be great.

THANKS!