[zeroradius]

to build a search engine you would need to make a web crawler I think it would work best in PERL though i belive php can make one as well. Basicly the crawler will go through a list of links you have said up, then it will branch off to the links on those pages and continue the process on and on. You would then need to come up with a way so that it only returns sites that seem to be relavent (still working that one out.) you would need a server dedicated to it, I would sugest host gator for hosting it. it has 95% up time and for $12 a mounth you can get unlimited ban width and more storage then you will need for a verry long time.

Edit: and it would be posible to get up to yahoo and google rank but it would be a lot of work. You would need to offer every thing they do and more. people would use your engine then (asuming it is close in how good it is to the others) because people like conveniance every thing in one site would make me go to it at any rate