Utterly worthless.
They're a bunch of amateurs playing pretend terror analyst. Have demonstrated repeatedly they don't have the foggiest idea what they are talking about. They serve the "terror scare hobbyist" by providing them with the desired scare-a-day.
And that whole group - Northeast Intel Network, et al - was singlehandedly responsible for ginning up a lot of nonsensical angst from November to January of this year.
Come February 2004, the jihadi web sites and forums were laughing at them for buying into the deliberately concocted scare stories and graphics, which were being devised specifically to incite NIN, et al.
They are still active (and have their own ongoing thread here on FR) but have zero credibility anywhere and everywhere.