Unity C# code for grabbing a JPG (or PNG) off the internet and bringing into Unity

DemoWebcam.cs

using UnityEngine;
using System.Collections;

// full reference: http://docs.unity3d.com/ScriptReference/WWW.html
// usage: place this on a gameObject with Mesh Filter and Mesh Renderer (e.g. a Quad, a Plane, a Cube)

// NOTE: this does NOT work in Web Player (browser security sandbox)

public class DemoWebcam : MonoBehaviour {

	// demo URL: http://207.251.86.238/cctv446.jpg (NYC DOT webcam, 14th st @ 6 av)
	// list of NYC DOT webcams: http://nyctmc.org/multiview2.php
	public string jpegUrl = "http://207.251.86.238/cctv446.jpg";

	// Start can be used as a coroutine
	IEnumerator Start() {
		// create a new "WWW" object that will fetch the web data
		WWW webRequest = new WWW( jpegUrl );

		// wait until the web data has finished downloading
		yield return webRequest;
		// you could also see whether (WWW.isDone == true) to see if it has finished yet

		// treat the web data like an image (only works for .JPG, .PNG)
		renderer.material.mainTexture = webRequest.texture;
	}

}