You don't know what you're talking about...FAST powers web search engines for lots of sites. CareerBuilder, Dell, IBM (at one point, probably OmniFind now). Their technology easily scales to terabytes of data using commodity servers. I should know, my employer uses it as our main search engine for all of our web sites. And the technology is built on a lot of open-source pieces with some proprietary glue and slick language processing. It's definitely one of the major search technologies in the enterprise search arena.