PLoS - Open-Access Journals

The Public Library of Science (PLoS) was formed in 2000 by scientists and physicians to make peer-reviewed research freely accessible online to the world. They publish the following open-access journals:

PLoS Biology
PLoS Medicine
PLoS Computational Biology
PLoS Genetics
PLoS Pathogens

Open-access journals are freely available on the web and are accessible based on a Creative Commons Attribution License, meaning you can copy, distribute and use the work so long as the original author is credited.

This is serious, reputable publishing - PLoS Biology was recently ranked in the top-tier of life science journals by The Institute for Scientific Information (ISI), with a preliminary impact factor of 13.9.