Here is the list of the most interesting and useful file search engines in our opinion.
They have huge databases, great traffic and unique file searching features:

Filestube.com – #1 search engine nowadays.
Rapidlibrary.com – former leader, pure data, good simple design.
Rapid4Me.com – young and powerful engine.
Kvaz.com – reputable old Rapidshare search engine with huge database.
Rapidshare1.com – good alternative search engine.
RapidshareIndex.com – great search possibilities.
Dbuf.org – file and video search.
RapidQueen.com – simple and fast file finder.
FilesBay.net – good and deep relevant search.

As you can see we have listed the leaders. Surely there are many other engines and we’ll add them after verifucation.