Well
claudiapriscus mentioned in her comments on 1.01
that it'd be an interesting AU if Crichton had not hit and killed Crais's brother and had joined the peackeepers. I wondered if there was fic on this idea already and... there is:
http://bifictionalbedlam.slashcity.net/guests/ghosts1.html I have not read it (yet) but perused the opening paragraphs. Tags on delicious have it as het John/Aeryn and it appears to be long.
I also wondered about DK/childhood friend and lamented his brevity BUT in my search I found a fic from DKs POV. I think (fairly sure) we only see him in 1.01 and if he's mentioned again, I also don't recall, so this may be an interesting read.
http://terrafirmascapers.com/index.php?PHPSESSID=fd78afb1956697f8eba92d1bb45d2efb&topic=12490 I have not read this one either, but delicious tags are: rating PG.
And I am too tired to trawl thru ff.net just yet.