Wine Glasses and Wire Cutters by Fish and RSB is a plotty little adventure that reads like a missing episode, rife with nice little character bits.
Paid In Full by Bookworm is another wondrous plot-filled gem.
Stay by Goldenthorn picks up where Heart of Gold leaves off, and has some beautiful character interplay between Mal, Inara, Kaylee and Jayne. Also? It has plot. Plot makes everything better, you know. Everything.
Robotics by rebecca is some pretty gosh-darned hot Mal/Simon that manages, while still delivering the erotic charge, to also be peppered with spot-on dialogue that absolutely rings true, whether you're a slash fan or not. I admit, I'm a sucker for talky PWPs. Folks get chatty, it happens, and it happens all too rarely in fiction, for some reason...
Fine Line by rebecca is a dark and gorgeous little Mal/Inara vignette that you can just taste, and is an excellent case for erotica sans dialogue, which is part of why I love rebecca. Girl's got range.
Oblivious by Rawles is a lovely and insightful look at a pre-Serenity Simon that also manages, at the same time, to create a perfect and balanced non-canon character to act as the audience's eyes and ears.
Kassandra by Philomel is a fascinating look inside River's mind.
Secrets to Tell by eleanor k. is a gorgeous little Mal/Wash/Zoe vignette set after War Stories, chock full of excellent dialogue, as well as wonderfully erotic.
Casualties by molly is a beautifully lyrical bit of crazy space incest. I can't figure out how the heck I missed this one, but I'm ever so glad I found it. It's thus far the only csi from Simon's point of view that I even remotely buy, in large part because molly shows such insight into the characters.
Changing by scrunchy is just a delight, and reminds me time and time again how much I love stef's Wash.
Volitional Cecity by Rawles is a beautiful little musing on the Tams that will just break your heart.
I Have Gone Out by shrift is a stunning and lyrical trip inside River, as she makes her journey through the dreams of Serenity's sleeping denizens.
All The Desires by budclare is a lovely little snapshot of the entire gang, and what they want.
You Fill Me by Rachel Elisabeth is a lovely look at Kaylee and Inara's special bond.
Love at First Sight by Trisana McGraw feels as if it's a scene from Out of Gas which Tim just left out, but would fit in seamlessly.
Memories of Guns by Jade is a gorgeous look at what life might be like for Zoe and Wash's child.