Ensuring high quality sources where needed, especially science/academic topics (narrow focus)

Also noting the idea of WikiCite - worth reading.

(Implementation notes - broadly, it involves a table of "indexed facts", a bit like a wiki-bibilography but fact based not source based. Tag these facts and allow searching by text, topic, tags, categories etc to make them findable: most people understand tagging these days. Then every fact asserted in Wikipedia should have a cite backing it. Those facts stated that don't, feed into "help Wikipedia!" in the user/reader interface for later addition.)