Continuations

The concept of 'Continuations' is getting more and more interesting to me recently. It's seems to be an important concept in Seaside, a few days ago, Stefan Matthias Aust presented a sample implementation of a minimalistic contuation based Web framework in de.comp.lang.java, today I found a continuation-based Chop-algorithm implementation by Jim Weirich ... . Hmm, I think I should consider putting 'Continuations' to my backlog of interesting concepts.