passive searching
 

If Xolox already does this than just tell me so...

I that Xolox may be able to return more search results if in addition to activly searching the network it also would take advantage of other user's searches that are sent through Xolox. This can be done by looking at searches being passed through, and comparing these to the searches that Xolox is currently running. If the search is a moderatly broad one, then this should help add more results without adding more traffic to the network.