sometime ago I brought around 10 domains... with a lot of keyword importance.. and then when I searched about selling them, I found that they wont sell until they have a combined economical importance.... i.e Daily Revenue does matter... so just started with a mp3 search engine on one of them, have a look guys... its here... lets see what happens... just tell me your views, by the time I set more up.. :))

Cheers!