According to a recent survey by The Leadership Network, the top two reproducing churches in America are Redeemer Presbyterian (New York City-pastored by Tim Keller) and Mars Hill Church (Seattle-pastored by Mark Driscoll). Both churches have planted over 100 new churches since their inception.
Along with a radical commitment to the gospel both of these churches are confessionally reformed (Calvinistic). There is a prevailing false idea that Calvinists are not committed to evangelism. Aside from this being historically inaccurate (cf. Spurgeon, Edwards, Carey, etc..) it is also out of step with what is occurring in our lifetime.
(ht: steve mccoy)