So we tried this tonight from the iCarly show. My husband and daughter wanted to try it- so the rest of us had plain spaghetti and they had spaghetti tacos. If my husband liked this I was going to SERIOUSLY reconsider all the compliments he gives me on my cooking- but luckily my daughter didn't like it, and he said it was OK but he'd rather have just spaghetti. phewf! That was a close call!
So basically it's normal spaghetti put in a taco shell. Here's a pic