(no subject)
Fire in the Sky
http://www.fanfiction.net/s/2835364/1/The_Fire_in_the_Sky
The dragonriders fic that should be read on its own merits.
What Lies Within
http://community.livejournal.com/torchwoodslash/370539.html?#cutid1
It was made to read as an episode, but it ended up getting a bit long (for an episode, not for a fic). Well worth reading, the plot fits and everyone is in character (even the tentacle porn).