This week is Open Access Week. Please check out the main website for the event, and check some of my past posts on Open Access under the heading "Labels" on the right.
Probably the most important thing individuals can do right now is to self-archive their papers (so-called green open access); see my posts on Self-Archiving. This makes your papers more available, and doesn't require massive changes in institutional funding or organization. When your papers are more available, more people will see them, read them, and cite them. This helps those people do research, it is good for the discipline, and it improves your visibility and impact.