This is very unfortunate, too, because it's creating a downward spiral. People who are legitimate are afraid to bring their ideas forward because they will be believed to be just another scammer. I've wanted to float the idea of a bitcoin bounty project (to arrange contributions for bounties on the most wanted bitcoin client improvements)
This is a great idea, please do it. I submit the best way to raise funds is to stream line the process and start a fund administered by you that people donate to, and then you use it to create bounties for bitcoin software projects.
This way people can arrange to make recurring contributions without having to concern themselves with the details like scouting for worthy projects.