I may vote third party, but I'm under no illusion that it will be anything more than a protest action (which no one will even be aware of). Even Ron Paul implicitly seems to agree with me on this, since he called a news conference of the more prominent 3rd party candidates from the Constitution, Green, and Libertarian parties (Barr slapped Paul in the face by canceling out at the last minute). Paul's message was basically, "Vote for anything but the Republican or Democrat to show your dissatisfaction with the status quo". This is not the message of someone promoting a particular philosophy, since the Green is basically communist and the Libertarian is the opposite.
If Paul actually thought the Libertarian or the Consitutionalist had a chance to win, he would pick one and support him. Heck, that's why Paul ran as a Republican; he has stated that the system is set up so that if you want to have a real impact, you have to do it through one of the two major parties.
Ron Paul's press conference was excellent. He was right when he said that voting Constitution, Libertarian, Green, or Nader would be a much better decision then voting either Republican or Democrat. Although I will admit I do not know nearly anything about the Green Party, but if you say they are basically a communist party, then voting for them may not be such a good idea, but I digress.
Even if you do choose to vote third even if it is only in a protest action, I say that is a good thing. Here is a good video that explains the idea better than I can:
A side comment, you are right about how Ron Paul said that the only way to the Presidency is to get through one of the two major parties. Of course, Paul has also said that Americans are starting to "wake up" and realize that the federal government is not working right anymore. I suspect that if things continue the way they are going now, we can expect some major changes to happen in this country (and maybe even the whole world) and hopefully for the better. Probably not this election, maybe not even the 2012 election, and perhaps not
even the 2016 election, but somewhere down the line, people are not going to take more of the same anymore.
And to think, when this year started, I did not even know of Ron Paul at all. His Republican nomination bid has opened up a lot of peoples' eyes (including my own). Hopefully, this type of movement will only get stronger as time goes on, but I digress, again.
EDIT: Forgot to mention, Ron Paul has actually endorsed Constitution Party nominee Chuck Baldwin. Strangely enough, that does not seemed to have helped his popularity very much. I guess some people are wary about putting what they concieve as a theocrat in office.