I often want to read something, but have no idea what I want to read.
If there were someway to set up a link that would make a completely random story come up. It would encourage people to read outside what they usually read.
Also, if it were at all possible, have a random fiction button for each category. Eg. A random romance story, or a random Dark/Angst fiction. That way if you knew what you wanted to read, but didn't know what specific story to pick, you wouldn't have to spend ages decided.
Just a random idea.