I was asked on Twitter what I'd say to someone who asked me to defend the practice of open-air preaching. I could do no better than quote Spurgeon:
No sort of defense is needed for preaching out of doors; but it would need very potent arguments to prove that a man had done his duty who has never preached beyond the walls of his meeting-house. A defense is required rather for services within buildings than for worship outside of them. (Lectures to My Students, p254)
Or maybe George Macleod:
I simply argue that the cross be raised again at the center of the marketplace as well as on the steeple of the church. I am recovering the claim that Jesus was not crucified in a cathedral between two candles, but on a cross between two thieves; on the town garbage heap; at a crossroad so cosmopolitan that they had to write his title in Hebrew and Latin and in Greek; at the kind of place where cynics talk smut and thieves curse, and soldiers gamble. Because that is where he died. And that is what he died about. And that is where churchmen ought to be, and what churchmen ought to be about.
Steve McCoy did some great posts on the subject back in February. In one of them he links to Manchester Pastor and Street-Preacher Kevin Williams.
Williams' hour-long video (embedded at the end of this post) is fantastic on the motivation, rationale and practice of street-preaching.
And here is a 5 minute excerpt where he discusses his "Zero-Apologetics" approach to evangelism. Don't you love an evangelist who coins the phrase "Zero-Apologetics"? Glory!
Here's Williams' whole video
You can download as an mp3 here.