Nice and useful idea, but you need the snippets to be "live"; for example, enable comments and editing, so that snippets get validated/improved/curated over time. Links to relevant stack overflow questions would be great as well.
There actually are comments. Making them "live" as you say is actually a really good idea it can be like a "proposed change" kind of thing where a user makes a change and people vote on it to see if it gets changed or not. If a certain amount of people vote for the cahnge then it replaces the old code.