Anyone have any good ideas of how better to encourage people to cite sources?
Move any uncited contribution to the talk page, and contact the contributor to tell her you've done so.
Note that I'm not saying there has to be a footnote for every contribution, but every source you use to create an article should be listed in the ==References== section. This isn't just for verifiability purposes. It's important to document your sources in case you are ever accused of copyright infringement or plagiarism.
And yes, I don't always follow this myself, but a) I really should, and b) I would if someone dropped me a reminder on my talk page to do so.
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Michael Turley User:Unfocused
Anthony