Fondue without Gruyere cheese
It's not a true Fondue but I've done something very similar by taking a white sauce base made with 50 / 50 wine and milk. You then melt in lots and lots of cheese and you get something very nice and similar to a fondue. You can pretty much use any reasonably melting cheese you like although a strong cheddar is very nice. For something really interesting add some Mozzerella and slowly melt it down and you get a wonderful stringy finish.