i dont think they do. After checking one of my sites that is fully indexed by all the major search engines i find that clusty only has 3 pages indexed
I thought it's an affiliate.Honestly,just first heard this search engine here.I'm not sure how they works for marketing but thanks for the added information you shared.
I thought Clusty was suppose to be a "cluster" engine that would give you lots of "similar" sites. Seems its changed a bit from what I recall.
As far as i know, that is meta search engine, so if you are listed in any other search engines like Yahoo, Google, you should be in Clusty too