Thanks for the post, Mike.
By the way, I've recently come across a review article on aspect that summarizes the complex state-of-art a decade ago:
Sasse, H.-J. (2002). Recent activity in the theory of aspect: Accomplishments, achievements, or just non-progressive state? Linguistic Typology, 6(2), 199-271.
I found this helpful because it allows me to see which aspect camp a particular linguist is working in (and there are a lot than the Porter vs. Fanning split in Koine Greek).
Stephen C. Carlson, Ph.D. (Duke)
Post-Doctoral Fellow, Faculty of Theology, Uppsala