I will brainstorm on this later when I get home. I would love to put something together that is more than just a website to catch the attention of more users.. as posted earlier there is already a website that does this but no one has heard of it. So it has to be more then just a website.
I agree partnering up with an exchange would be idea and I have even thought about starting an exchange that would push this agenda.
How would users accept a new exchange that Promised to do everything it could to prevent scams? would it be considered a scam? yes at first I believe so. I would be willing to invest a reasonable of money to make this a reality but would need a couple of good devs to run everything.
New exchanges seem to have difficulty catching on, and even if you have the funds to start one, how do you prevent scams exactly? If you offer a coin and a dev vanishes, how can an exchange stop this?
As for websites, coinssource which is in my sig, has a lot of data on coins, which could help people. But a specific site dedicated to scams may be of some use. The problem there is bias. Plenty of people here have made threads listing what they perceive as scam/shit coins. Quite often it boils down to -- scam/shitcoin that thread starter doesn't own = bad. If they own it = good. So if you go the website route, make sure whatever you list is a real scam or overly shady, not some iffy coin that may or may not be a scam.
If you want to start a coin to get people's attention in regard to scams, do the website, and offer a freebie coin given away to people who have been scammed ... ask for proof of ipo fraud/exchanges folding/icos that went bad due to devs vanishing, and that sort of thing. At the least, it may get some attention... tons of people have been scammed here one way or another.