Grokker here, Grokker there

Seems like Grokker has been popping up left and right in Libraryland lately. First, I learned (not too long ago) from that Grokker's search engine can be set up as a metasearch tool.

Then I found out that Stanford University has been trying Grokker out for metasearch:

• Stanford University Libraries page about it
• Grokker's case study of the Stanford's implementation (PDF, 200k)

And today, I heard that Grokker is also the tool behind the forthcoming "Visual Search" tool on EBSCO databases.