Conditionalism, or conditional immortality, is essentially a slightly more nuanced view ofannihilationism. That is, it agrees with annihilationism that the fate of the unrighteous is annihilation (i.e. non-existence), yet it goes one step further by positing that the reason this is their fate is due to the fact that humans are not born naturally immortal. In other words, we are not born with an immortal soul (contrary to the traditional teaching of most of Christendom).
I am looking forward to the rest of the series. The view that the soul is not by nature immortal is becoming increasing popular. Hurrah for that! I think the internet allows a wonderful free market in ideas.
I found the comments on the above post a good read too. Afterlife | Conditional Immortality, Soul Sleep and Annihilationism
is one website that is dedicated to exploring these issues.
If you know of other great links please leave them in the comments