This is from my other blog, Greif Support!

If we support greifing, we support creepers!
We are against greifing but creepers greif
too!

Some of you might be thinking of redstone traps but
if a creeper is on the other side of the wall, your on the
other side, still can explode. And if you come out you
will fall for the redstone trap. (Now that's a trap)

Any idea of how we can stop them?