Olympus E-400 has a Four Thirds lens mount and currently there are 47 native lenses available for this mount.
The latest released lenses that are compatible with the E-400 are the Venus 33mm F0.95 CF APO, the Samyang 135mm F2.0 ED UMC and the Samyang 300mm f6.3.
Olympus E-400 doesn't have a sensor based image stabilization system but
3 of these lenses already comes with optical image stabilization.
Since Olympus E-400 has a Four Thirds sensor, it has a focal length multiplier of 2× so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on E-400.
You may also also be interested in these:
Olympus E-400 Lenses with Image Stabilization
Olympus E-400 Lenses with Weather Sealings