He’s got $20 million in campaign contributions, hasn’t spent much of it, and the Libertarian Party has issued an offer for him to participate in their nominating convention in May.
Ex-House member Cynthia McKinney will probably get the Green Party nomination, thus we could have two credible-to-strong third party runs in 2008.
(And I would not count Bloomberg out quite yet either…
As for Nader, if he runs, it will be a non-event and embarrassing to him. He’s done an extraordinary amount in 4+ decades, but it’s time for him to retire before he becomes a parody of himself.)