YES! Another enlightened soul. Welcome to the forum.
As I see it, the next smaller party to be created and join the ranks of the Libertarian party, Constitution party, and the remains of the Reform party will be the Christian Democrats (come up with whatever name you want for them). It will be the group of Democrats who are Pro-life and Anti-gay marriage (key differences than the Democratic core). They might possibly be pro-NRA as well.
As the Constitution and Libertarian parties continue to evolve (and possibly merge?), you might see a few more Republicans begin to drift over. Hopefully in the next few elections we'll see a strong third-party candidate that can make a serious run for the White House. The Libertarians could do it in 2008 if they would just follow my suggestions and advertise for the next 4 years (doubt they will) and pick a well known business person with name recognition as their candidate or VP candidate.