Darwins theory of evolution was partly inspired by the obvious differences between tortoises from different islands. Ironically the only reason he had stopped there was because the captain wanted to load up on fresh (tortoise) meat.
There used to be two giant tortoises species on the island of Mauritius (home of the Dodo) but they were quickly extirpated about the same time as their flightless companion, by passing sailors. Read about them and their neighbours
The species that inhabited the Aldabran islands still survives in the wild. You can see pictures of it here. There is an obvious difference between the shells of these giant tortoises and those from the Galapagos. There has recently been talk of newly recognised members of some of the other indian ocean giant tortoises More on the Seychelles giant tortoise species
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