Riot’s League of Legends forums have a brilliant subforum posting specially dedicated to player created guides. Players looking for informative reading material can go there, rather than search the entire set of subforums for guides housed within each section.
As a guide writer myself, I feel this is an opportunity sorely absent from the official forums. The beta weekends alone produced a harvest of functional and informative guides, and the pile keeps growing. But many players lack a way to quickly discover or access these guides since no central listing exists.
If a Player Created Guides subforum existed for players to post their guides or links to their guides, it would make a fantastic resource. Including a stickied listing where the guides which meet certain quality standards are organized in an index would seal the deal, too.