It is a good idea to upgrade, as is usually the case because it includes an important security fix. Download the latest version of here. More information on the release can be found here. Installation / Upgrade help. Buy a wordpress T-shirt!

An important note is that this is the last release before the 2.1 version is out so if your a plugin developer it would be a good idea to make sure your plugin is compatible with 2.1 when it comes out.