A few images to illustrate the suspensions tech segment in Episode 110.
Girder Forks: Not the best angle, but it shows the fact that the fork is one solid unit, with springs at the the steering head.
Girder Forks 2: A nice shot of the parallel links at the top of a girder fork.
Leading Link Forks: The linkage is at the bottom, near the wheel hub. Springs are at the top in this case.
Earles Forks: No change in wheel base with this setup, and great for sidecars.
Hub-Center Steering: This Bimota Tesi is one example of a hub-center steering setup. Note that theres nothing at all where the forks would be on a standard motorcycle.