And it has (almost) nothing to do with real estate. 

They have this tool called TimeTube for YouTube.  It is kind of cool.  Instead of searching YouTube and getting a list, the result is a cross between a tag cloud and a timeline. 

TimeTube by Dipity

Frankly, it could just be a groovy timewaster... or it could be a great tool to search videos and find what me be most relevant to your specific needs. 

I guess it all comes down to reasons one may search YouTube for videos. 

Every Sunday I toss a couple of videos on my LaneBailey.com blog.  I obviously have to search out videos sometimes (other times, the videos find me) and this might be a way for me to find both popular and less well known videos.