I've noticed that we're beginning to get questions asking for help on solving Trailhead Challenges. I'm more than a bit uncomfortable giving the solutions to those questions for two reasons:
There are links to resources that provide the material needed for people to solve those problems on their own. Most don't seem to have even bothered to follow any of those links to look at them before posting here. In that sense, I don't feel as though they meet our criteria.
There's also a new Forum in the Salesforce Community that's dedicated to supporting Trailhead, both with technical issues and solutions with the challenges.
Finally, because these Challenges are somewhat akin to taking an unmonitored certification test, it somehow seems inappropriate to me for us to post answers to the Challenge questions here on SF.SE.
I look forward to hearing your thoughts on this issue. As a final thought, do we want to create a Trailhead Tag for these questions?