I can confidently say that Cocolat has been my BEST find in Adelaide. It's a dessert cafe down in Rundle Street.
We had cakes there, and unfortunately they've been gobbled up too quickly that I ended up only having a photo of their amazing tiramisu:
It was soooooooo good. The cake was encased in milk chocolate, topped with shaved white chocolate and served with fudge and cream. I was in heaven for 5 minutes.
I bought a box of their truffles (and thought that maybe they're not as great as the Chocolateria San Churro here in Sydney), but my, to my surprise... They were even better! The truffle menu can be found here (expect to drool).
My chocolate experience in Cocolat was absolutely amazing that I had to go back to buy another 2 boxes of chocolate and indulge myself in 2 massive scoops of their gelato!!! If I'm not mistaken they've been awarded chocolatier of the year and they truly deserve it!!!
Cocolat is unique to South Australia and nowhere else so I suggest that when you go there you make sure that it's one of your stops!