Tell them the Search Keywords to go Google instead of giving them the actual answer, and eventually they'll start going to Google first because they know you'll just send them there anyways.
It's works out quite well for me when people ask for extra help in comments on Stack Overflow, or email me for tech support from my blog. Rather then give them the answer, I tell them something like If you Google "W3C HTML5 font tag", you should find your answer in one of the top search results.
It's surprising the number of people that can't Google effectively, and they just need a bit of guidance in how to pick good keywords.
It's kind of like that old chinese proverb:
Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.