Any story originally posted or substantially revised in the past five years is eligible (so: 2003-2008). They will confirm approval for all nominations with the authors, and the stories must be available online.
If you're interested, see their community profile, nominating rules, award categories, and the nominations post itself (to nominate, you post a screened reply to that post). Note that there's an eligibility password in the rules.
Please consider checking their nominations to see which contemporary FK authors are missing, and then nominating excellent stories by them. Please encourage FK authors to write more FK fanfiction! Nominating them for awards is one good way to show we would like to read more.