While I don't think doing a search should be required before every SoPW post, it might be a good idea to require reading of certian nodes, such as how not to ask questions, before one's first SoPW. In any case, I think the best system to get good questions out of people is a combination of the two existing ones. First, downvote bad questions, and upvote good ones. Second, when somebody posts a "code this for me" node, tell them what they've done wrong, in a helpful and non-abusive way. "You might want to look at Some::Module; if you show us some code we'll give you specifc help". If there's some search they should have done that's fairly obvious, link to the search, and not to the results, or at least explain how you got the results.

"I searched on search.cpan.org for 'ping', and found Net::Ping" is much better then "look at Net::Ping.