Fullmetal Alchemist
Courage Bared To The Soul, by
hysteric_blue Ed/Riza. Lovely, well written, in character. And it is so hard to find in character Ed/Riza.
Moments Out of the Ordinary, by
theladyfeylene Havoc/Winry. Awesome, awesome Havoc/Winry. Funny, sweet and Winry just shines here.
Anatomy, by
stereonights Roy/Ed. Clever, smooth, understated Roy/Ed.
The Bottom Line, by
artemisrae Sig/Izumi. It's so sweet, and funny, and them.
Avatar
Another Brother, by
AvocadoLove Gen. AU. WIP. Zuko joins the Water Tribe, and it makes for a wonderful story. I am usually pretty wary of AUs, as there is almost always at least one character that ends up butchered beyond recognition, but that doesn't happen here.
AvocadoLove managed to change a big part of canon without losing anything that made the series so awesome.
Empty Doors and Maple Leaves, by
Resmiranda A story about Koh. There needs to be more of these.