I know the Wikiproject I was a part of had a list of reliable sources, and it was a go-to list to help settle issues with less reputable sources. I think we can make this even more powerful with the right tools. Using some sort of scholarly service would definitely help elevate the quality of sources, and settle disputes with less reputable sources. I always thought that Wikipedia should have its own internal search engine, which weeds out personal websites and other BS, and only searches peer reviewed sites with a reputation for fact checking. That would settle these issues quickly and effectively.