The best way for me is simply the yellow "report" button at the bottom of a post.

I'm not sure how often the other mods check up on the post reports, but I've been cleaning them out slowly but surely.



If you don't have anything nice to say at all, stay out of the newbie forum. Reminding people about the search feature or linking them to stickies is acceptable as long as it's being done in a helpful manner.
Take this as an example.