I found a Jira ticket [JBREM-344] that was created 15/Mar/06 titled "support for NTLM authentication" but that was for JBoss remoting.
I did find this link "http://jcifs.samba.org/src/docs/ntlmhttpauth.html" on setting up NTLM in a servlet enviornment but it's the only documentation I have to go on.
If someone else has used NTLM authentication I'd love to hear form you.