How will you deal with aging, increasingly inaccurate content? The rot will be slow and correction will be tedious.*
Ranking also seems relevant if you choose to go the 'social proof via up votes' route.
A content community (which I believe something like this is trying to create) is great. A content community that curates itself is just awesome.
*edit, previously: "How will you deal with aging, old, inaccurate content?" [added content rot as an after thought, 'aging' describes the reason for the 'inaccuracy' (rot) ]
Disclaimer: this is posted from mobile. Haven't had a chance to give the plugin a spin.