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I believe that the ASP.NET reCaptcha control makes it pretty simple to plug it in.  You can put it on the control, and set your API keys to get it to show.  However, you'll then need to make an AJAX request to their validation service to see if they've correctly filled it in before sending the request to process the email.  So, depending on how comfortable you are with using jQuery to make an AJAX request and evaluate the results, it may or may not be a simple addition (though Tell-A-Friend itself is an example of doing that same thing, which may help you get started).

Hope that helps,

 When the message sends correctly but the error message is shown, it means that the response from the email web service call wasn't processed correctly (i.e. the web page thinks that the success response was actually an error response).

How did you fix the issue before?  You added the dataType parameter to Tell-A-Friend 1.1?  You might want to use FireBug to monitor the response that you get back from the service and see why it's not what you would expect.  You may also need to step through the JavaScript to see if something isn't being processed like you'd want (you can set breakpoints in the JavaScript through FireBug).

Hope that helps,