From Andrew Gerrand's talk: Go: code that grows with grace http://vimeo.com/53221560 Notice that because the connection is a reader/writer io.Copy can be used. Short and sweet. Also notice that io.Copy runs in an infinite for loop so long as EOF or an error has not occurred.

gistfile1.go

//As seen in: http://vimeo.com/53221560 (Andrew Gerrand's talk: Go: code that grows with grace)
//A concurrent Echo Server

package main

import (
	"io"
	"log"
	"net"
)

const listenAddr = "localhost:4000"

func main(){
	l, err := net.Listen("tcp", listenAddr)
	if err != nil{
		log.Fatal(err)
	}
	
	for {
		c, err := l.Accept()
		if err != nil{
			log.Fatal(err)
		}
		
		go io.Copy(c, c)
	}
}