Wow, this is an old thread. Anyhow, here are my thoughts on Fondue/Raclette in Zurich.
1) Avoid the fondue tram if it is the fondue itself you're after and not just atmosphere - it really is the WORST fondue I have ever had - we did a team outing on it last year and while the atmosphere was fantastic, the fondue really s***ed

(my whole team thought so.)
2) I still like Le Dezaley best if you have a group of people and not everyone is a cheese fondue fan. Not the best cheese fondue in town but certainly acceptable and everyone can order whatever they want.
3) My favorite cheese fondue in Zurich City is Fribourger Stubli -
http://www.fribourger-fondue-stuebli.ch/ - need to book in advance though. Cheese fondue is all they have though so everyone has to be interested in having it. (You'll see they are related to Chässtube and Raclette Stube - both also good.)
4) Best restaurant with both fondue and raclette is in Kusnacht - don't have the name of it off hand - will edit message when I can get it. Only place I know in Zurich that does raclette the traditional way - melting the wheel of cheese in front of a woodburning fireplace (right in the restaurant). Again, need to book ahead for this place.
5) Fondue with a view - for a team christmas dinner we had fondue up at the Uetliberg. Like Dezaley, they have more than just cheese fondue - we had the meat one (Chinois) and it was excellent.
Mmmm, now I am in the mood for fondue!
EDIT - ok, was slow in hitting "submit" so apologies for the repetitive responses.