Nominations are now open for the 2013 Nebula Awards. The nominations are open to Active, Lifetime Active, and Associate members. Voting closes February 15.
A writer doesn’t have to be a member of SFWA in order for their work to be considered, but a member (with no fiduciary interest–which means, not the writer, not the editor, the agent, publicist, or significant other) may nominate a work during the initial nomination period, which runs November 15 of the eligibility year through February 15 of the following year.
The best way to have a work considered is to make sure that it is available to be read by SFWA members; SFWA members can put a link to an electronic version of a work in the Fiction area on the SFWA forum. Non-members can ask a member or the Nebula Awards Commissioner to post a link or document to the Forum.