Check WordPress ?lugin Compatibility before Upgrading
Now, wordpress users can check if the plugin is compatible with their wordpress version before installing the plugin itself. This feature is in testing (Beta) and has been implemented for several plugins in the wordpress directory.
You can check this for any version of wordpress and the plugin itself. Check the screen capture here:

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When you install some wordpress generated plugins, that is the plugins designed by Automattic.com, you need to use your wordpress.com API key to use that plugin. Some examples are: Akismet and wordpress.com statistic.
Every user of WordPress.com gets a unique API key they can use to access a number of services. This key should be kept as secret as your password