NITF is fairly well aligned with HTML -- conversion isn't nearly as difficult as getting a data feed that actually takes advantage of NITF. The Associated Press data that I've examined is nothing more than the AP Online wire with very minimal NITF markup. Reuters is much farther along, but has created another XML layer -- NewsML -- as a "wrapper" around NITF and other data types. This has some strengths but obviously complicates the process.
Are you a subscriber to the NITF and NewsML mailing lists?