Okay Starkiller, ready for spoilers?
There is a bunch of material about Earth and Shadow tech, before and after Clark. Clark's regime was short-lived, but Earth's obsession with Shadow tech was going on for some time before it. These are the people tasked with developing the weapons to fight and win the next war, and as far as they are concerned, the likely enemy is the Minbari (and the Shadows exploited this psychological fixation). With Humanity almost being annihilated the last time, they must win next time. This project also involves IPX and Psi Corps (see below).
Ivanova destroyed Clark's battlegroup of Shadow Omegas in 'Between the Darkness and the Light,' but we never find out where those ships came from. After Clark dies and the war is won, she then exits stage left and goes on to command the Warlock destroyer Titans, which is revealed in the short story 'Hidden Agendas' to be using Shadow tech as its central control system.
The Shadow hybrid ship that destroys the Cerberus in 'Crusade' (further explained and used in two of the unproduced scripts for the series) is one result of this project. And the Cerberus was destroyed in 2259, so the hybrid design is at least eight years old by the time 'Crusade' begins. Galen also, umm, interacts with one toward the end of the second Technomage novel (same event as Gideon's flashback of the Cerberus). And the unfilmed script for the season finale, 'End of the Line', really goes into who's building these ships and why.
So after Clark's death, Earth's interest in Shadow tech is still quite strong. The project continues, presumably carried out by IPX, EarthForce New Technologies Division, the Office of Planetary Security, and whoever else is lurking in the darkest corners of EarthDome. I know the short stories and unproduced scripts are not (yet) readily available, but they can be found. Cool stuff, too.
I'm halfway through the first Psi Corps novel, and there's a part where IPX is experimenting with organic tech they've found on Mars, 100 years before Babylon 5 begins. And the MRA, soon to be the Psi Corps, wants in. Really good book, I love Keyes' writing. Right man for the job.
Raw Shark
"And that, my friend, is how you win an Opium War."
Monty Burns