Wikipedia recently started WikiProject Geology, "a collaboration area and group of editors dedicated to improving Wikipedia's coverage of geology." The project site lists the editors who will be contributing to the project and proposed subjects (http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Geology).
If you look at geology topics in Wikipedia now, it's pretty incomplete and eclectic. While a number of scientists disparage Wikipedia for its reputation of errors and biases, it is still one of the main online resources, especially for students and others not familiar with geology. It behooves the geologic community to help make sure geology is well represented and accurate online.