This important update addresses a variety of high priority gameplay and network issues. Since most of the fixes for these issues took place in the server software, clients that are playing on older servers may still be affected. Therefore, if you’re running any v1.0.x servers, we strongly advise you to upgrade for the benefit of your players.
Download and full changelog: MTASA.com
You can nominate MTA as the best mod of 2009 at MODDB.com.