There's no such thing as the Independent party. Perot started the Reform party. "Independent" means no party affiliation, like Senator Jim Jeffords and Representative Bernie Sanders.

As for Nader, just because he has declared his candidacy doesn't mean he's going to make it on the ballot(s). He needs to get 700,000 signatures to make it onto the ballot in all 50 states and I don't think he's going to be able to get the same kind of support he had in 2000. Back then, we had 8 years of a Democrat president and the far left wanted to push even more in that direction. Now we've had a Republican for 4 years and he is universally despised by anyone more than a little left of center. Even though Nader refuses to acknowledge the spoiler theory, people who voted for him in 2000 will most likely be more focused on unseating Bush than on making a statement. He's got a whole argument about how he didn't cost Gore the election in 2000 but the data isn't really convincing. No doubt some of the Deaniacs will jump ship for Nader (I personally think the timing is mighty suspect) but I think most of them will congeal around whoever the Democratic nominee is.