Wikipedia is a great resource, but it's also one of those success stories that owes as much to the incompetence of its competitors as it does to its own merit. I've often thought it would be interesting to create a "Wrapipedia" of sorts, basically a copy of the Wiki codebase that could be used to circumvent Wikipedia's often-nonsensical notability and deletion rules.
Basically, instead of going to wikipedia.org to look up something, you'd go to wrapipedia.org, which would issue the query on your behalf and supply its own page if the Wikipedia lookup fails. Wikipedia pages that were created by users but subsequently deleted by editors would essentially be treated as pure virtual functions to be implemented by wrapper classes. As with Wikipedia itself, users could create new entries and edit existing ones.
That way the original Wikipedia project could remain true to its charter without leaving its users frustrated or unsatisfied. Its editors would also appreciate an alternative to being insulted and browbeaten by annoyed users, I'm sure.