Yes, these checksums are incorrect.  The same problem exists in the other repo groups also.  I'm not sure why though, I will check with Sonatype to see how to fix this.

I'm not sure if this is related but many of the dependencies of:

{code:xml}
<dependency>
  <groupId>org.jboss.jbossas</groupId>
  <artifactId>jboss-as-client</artifactId>
  <version>6.0.0.Final</version>
  <scope>provided</scope>
  <type>pom</type>
</dependency>
{code}

have invalid SHA1 and MD5 checksums.  These are what I've found so far:

{code:xml}
<dependency>
   <groupId>org.jboss.classpool</groupId>
   <artifactId>jboss-classpool-scoped</artifactId>
   <version>1.0.0.Alpha6</version>
</dependency>
<dependency>
   <groupId>org.jboss.classpool</groupId>
   <artifactId>jboss-classpool</artifactId>
   <version>1.0.0.Alpha6</version>
</dependency>
<dependency>
   <groupId>org.jboss.classpool</groupId>
   <artifactId>jboss-classpool-jbosscl</artifactId>
   <version>1.0.0.Alpha6</version>
</dependency>
<dependency>
   <groupId>org.jboss.classpool</groupId>
   <artifactId>jboss-classpool-ucl</artifactId>
   <version>1.0.0.Alpha6</version>
</dependency>
<dependency>
   <groupId>org.jboss</groupId>
   <artifactId>jboss-reflect</artifactId>
   <version>2.2.0.Alpha6</version>
</dependency>
{code}

Manually specifying the GA releases does fix this issue.