Tim Challies has the best blog for resources any Reformed youth minister could need. It was on Tim Challies that I found out about David Murray's video series about the Angel of the Lord in the OT. It is there that I get good discernment news and articles concerning other preachers without feeling angry with said people. I even get good pro-life articles there.
Here is a wonderful article piggy-backing off of R.C. Sproul's sermon this week on Renewing your mind.
And here's an amazing infographic about the tabernacle, a topic that always fascinates me.
Go have fun on his site!