This approach reminds me of YACY even though it's only somewhat related. Instances of the engine indexing locally on the machine where a user is browsing the w

This approach reminds me of YACY even though it's only somewhat related. Instances of the engine indexing locally on the machine where a user is browsing the web. I'm regularly reminded of this concept of a distributed search index, but at the moment it doesn't seem very likely that it'll gain traction.