In our day to day life there are lot's of work related to household for which we could not spare time to search the best among the choices. For example. if we need a carpenter, maid, painter etc for some household work we can't get them directly rather we have to go to an intermiddiator.
My idea is to design / develop a site that keep total information & contact of such helpers. There should be a proper organization to whom all such workers can provide their information and this organization would investigate completely including police verification and others and then publish their skills, contacts and past details on site and anyone can directly get in contact with them and because they are already verified by the organization it is more reliable than other sources.Even the security willn't be a big issue.