The most recent release, OJS 2.1.1, adds new articles to the bottom of the TOC. There is upgrade documentation in docs/UPGRADE, but briefly, the upgrade is a two-step process -- first you need to download and install the new code, and then you need to run the upgrade script to bring your database up-to-date. Make sure you back up your installation before beginning.
Public Knowledge Project Team
Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada