this was the unbelievable useful tool to get competitive data (traffic, queries) about other websites. it was not perfect, the data was sometimes months late. but it was good enough to compare websites with each other.
now it's gone. probably it didn't fit into google strategy. probably someone at google decided that "we are not in the business of providing competitive intelligence data of websites" (i guess that, as the google adplanner was stripped of lots of website data in the same timeframe )
the same thing with the product mentioned above. it will be killed. maybe not this year, maybe not next year, but sure as hell sometime.