Here i'm using MvcContrib.Watin testhelper together with the SpecFlow hook for AfterScenario to capture a screen shot on each failing tests, naming the

CaptureScreenShotsOnFailure

using Specs.EndToEnd.Helpers;
using TechTalk.SpecFlow;

namespace Specs.EndToEnd
{
    [Binding]
    public class SpecFlowHooks
    {
        [AfterScenario]
        public void AfterScenario()
        {
            if(ScenarioContext.Current.TestError != null)
            {
                WebBrowser.Driver.CaptureScreenShot(ScenarioContext.Current.ScenarioInfo.Title);
            }
        }
    }
}