First off, let's see some more spoiler tag of the preview...I'm seeing a lot of unsubstantiated comments, and I assume this is from whence they're coming. Please stop.
As for the episodes themselves, an extremely exciting second hour that really makes for a neat scenario. Tony/Henderson in the Medical Ward, the Situation Room isolationites...but what about Lyn? I know that this ending was very much more about Edgar's death, but we really didn't see what exactly happened to so many others.
As for Edgar, it was a touching and tragic scene, that's for sure. I must say that it was obvious the second that Edgar went off to the room that he was a goner, but at the same time it was incredibly tragic when it went down. Definitely a solid use of the silent countdown, and definitely extremely effective.
Thumbs up to 24 on this one. One great Jack moment, one tragic moment, and a nice setup for a little multi-episode arc.