Well I got a new leopard gecko book today and the one part was talking about mixed species vivs and was just wondering if anyone has a mixed species tank of some sort?

It is not recommended for multiple species to be housed together for the general reptile keeper. In order to have a successful multi species viv you would need a VERY large one and be VERY experienced with every type of species in it. And even still there are many risks.

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There are a few people who do it with certain species, If I had enough space i'd love to try a little mini rainforest myself, and by enough space, i mean goodbye guest bedroom
Generaly i'd have to agree with shell, it is tough, and i'd advise against it.
There are some species that do seem to mix well, but I personaly don't know of any other animal that would mix well with leopard geckoes.
The problems are not just a matter of will they get along, there are parisites you have to worry about, different needs, competition and stress (which alone can kill some repties)

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"Nobody can do Everything, but Everybody can do Something."

Yeah I read all about it, seemed like an interesting thing to do, but too complicated.