It took me a while to figure out the right way to get JSF2 dependencies in Maven. The right solution is:

<repositories>
	<repository>
		<id>sun</id>
		<url>http://download.java.net/maven/2/</url>  
	</repository>
</repositories>
<dependencies>
	<dependency>
		<groupId>com.sun.faces</groupId>
		<artifactId>jsf-api</artifactId>
		<version>2.0.3-SNAPSHOT</version>
		<scope>compile</scope>
	</dependency>
	<dependency>
		<groupId>com.sun.faces</groupId>
		<artifactId>jsf-impl</artifactId>
		<version>2.0.3-SNAPSHOT</version>
		<scope>compile</scope>
	</dependency>
</dependencies>