The Institute of Physics has launched the IOP Conference Series: Earth and Environmental Science, an open access proceedings service. A FAQ is available.
Here's an excerpt from the press release:
Based on IOP Publishing’s highly successful open access proceedings in physics, EES allows conference organizers to create a comprehensive record of their event and make a valuable contribution to the open access literature that will be of long-lasting benefit to their research communities.
As part of the service’s launch, EES is waiving a total of US$5000 of publication fees for a number of conferences who expect to publish their proceedings during 2008.
We are delighted to announce that the first conference to qualify for this is the 14th International Symposium for the Advancement of Boundary Layer Remote Sensing (ISARS2008) which takes place on 23–25 June 2008, Risø National Laboratory, DTU, Roskilde, Denmark.