This page was originally for Serenity webcomics, but now it'll be for those, as well as any short story that appears in print but not as a regular release, such as FCBD comics or bonuses that might appear in compilations.
Serenity: The Other Half
Story by Jim Krueger; art by Will Conrad
Wikia; Wikipedia
This brief story is set in the time frame of the TV series Firefly, soon after River and Simon joined the crew, I think. There's nothing in particular I feel like saying about the story, but it's okay, and definitely worth the couple of minutes it'll take you to read. On the other hand, you won't really be missing anything if you don't....
It originally appeared (for free, in 2008) as a webcomic on Dark Horse Presents (an online anthology series that previously existed on MySpace, but now seems to be gone). It can be obtained in a collected print copy of Better Days, which also contains Float Out and "Downtime," although I'm not sure if I'll ever bother getting that. It used to be available as a digital comic on darkhorse.com, but it's gone now.
This debuted online in 2010, but I never heard of it until 2013. And I haven't read it. It used to be available on darkhorse.com, but it's gone now.
This first appeared in print in 2012, on Free Comic Book Day. But since I didn't get to go to a comic shop at the time, I wasn't aware of it. It used to be available on darkhorse.com, but it's gone now. It's available as a bonus in the compilation of the Leaves on the Wind miniseries. Sometime after the movie (and before "Leaves on the Wind"), Serenity is on some planet getting supplies. While Zoe and the others are gone, a man named Frosty shows up at the ship with the idea of stealing it. Mal tries to talk him out of it, but when that doesn't work, Frosty is stopped by River. It's a reasonably fun little story.