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[chuck]

I finally figured it out! Here's the relevant JavaScript code:

function checkAnswers() {
  // Do stuff to see if all answers were correct
  ...
	
  // Send all correct status back to Objective-C
  window.location = "/allCorrect/" + allCorrect;
}

Here's the relevant Objective-C code:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
  if ( [request.mainDocumentURL.relativePath isEqualToString:@"/allCorrect/false"] ) {
    NSLog( @"Nope, that is not right!" );
    return false;
  }
	
  if ( [request.mainDocumentURL.relativePath isEqualToString:@"/allCorrect/true"] ) {
    NSLog( @"You got them all!" );
    return false;
  }
	
  return true;
}

I also just posted this as a tutorial on my blog: iPhone/Web 2.0 » Send a BOOL value from JavaScript to Objective-C.