It's also a crib-sheet of sorts for some people who've PM'd me to say that they're a bit lost.

As of our current timeline's date, here are the ongoing threads:
Akira Nakai's story is at end-2040 with 'Fathers'.
Rika Katayama's story received a one-shot set in 2042, 'Stirrings'.
'A Left Eye of Darkness' has reached 2043 with 'The Girl From The Village'.
'Mistaking Identify' has jumped temporarily into 2044 with 'Endgame'.
'Straw—A Dream of Suzu' has reached 2048 with 'Interregnum'.
'Sakura—The Kenji Saga' has reached 2048 and then 2052 as Book Six 'Silent War' continues.
Work that's complete, not quite in progress, progressing separately, or on hiatus—in alphabetical order:
Akio Mutou's story is complete for now, with 'Pavane' being the last major addition.
Akira Satou's story is complete for now.
'Crane—A Dream of Molly' has ended its establishing arc, with Molly graduating from Yamaku in 'Cracking' (2008). There's a lot left to do.
Emi's story is complete for now, with Akiko's secondary arc also complete.
Hanako's story is complete for now, but there is a secondary arc that hasn't appeared yet.
Hisao's 'secret arc' is complete.
Lilly's story is complete for now, both the initial arc and her testament.
Natsume's story is complete for now, but it has to dovetail with 'A Left Eye of Darkness'.
Rin's story is complete for now, with Miki's secondary arc also complete.
Shizune's story is complete for now, as are Hideaki's and Misha's.