Doton+Katon=Lava element
Doton+Suiton=Wood element
Doton+Fuuton+Katon=Dust Release
Aside from that, I don't think anything has been confirmed yet. I recall seeing something about the Magnet Release being a combination of Doton and Raiton, but I'm not certain if it's true or not. I know for certain however that Doton is one of the elements needed for Blast Release, meaning that if I'm correct about the Magnet Release, that element would be Fuuton. (If not, then Doton+Fuuton=Magnet, and Doton+Raiton=Blast Release, although I do feel that it's most likely the other way around.)The Doton element is strong against Suiton, due to the fact that it absorbs water, and is by nature more solid and heavy, while water is a fairly light liquid.
However, it's weak against the Raiton element, due to the fact that earth is a good conductor, resulting in the ground being fractured by the electricity.An example of a notable user of the Doton element would be Kitsuchi. Through the Doton element, he has, for example, been able to:
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in V2 with his Rock Fist technique.
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for protection.
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. (With the help of his daughter)
Another example would be Ohnoki, the Tsuchikage, who possesses the ability to use the Rock Fist, Rock Clones, and the immensely powerful Jinton.