http://codecentral.borland.com/codecentral/ccweb.exe/listing?id=15717
  http://www.zelix.com/ 

Here is a list of links to 3rd party obfuscators:

1stBarrier (JProof)

  http://www.jproof.com/products.html

  http://www.2lkit.com/products/2LKitObf/index.htm

  http://www.condensity.com/

  http://www.preemptive.com/

  http://www.force5.com/

  http://www-personal.engin.umich.edu/java/unsupported/jobe/doc.html

  http://www.helseth.com/

  http://www.e-t.com/jshrink.html

  http://proguard.sourceforge.net/

  http://www.retrologic.com/

  http://www.4thpass.com/sourceguard/

  http://www.zelix.com/

(Link list provided by John McGrath.)