Donors can now give money online to every charity in America. Seeking to do good works -- and to make money doing it -- a score of dot-com businesses have started Internet sites that they hope will become a one-stop place for donors to make all their gifts to charity. Some of the sites offer donors the opportunity to give to any organization that has been granted charity status by the Internal Revenue Service, while others are more selective. Such giving sites, or "philanthropy portals" as they are sometimes called, have been cropping up so fast that non-profit officials cannot keep track of them all. Many were started in the last six months, while others are still so early in the development stage they have yet to be announced to the public.