From DCRP:

Olympus has released new firmware updates for their E-3 and E-510 digital SLRs, plus the 70-300 mm Zuiko lens. Here’s what you’ll get by installing the updates:

E-3 DSLR body:

• Dial operation on the power grip HLD-4 has been improved. The relationship between the rotation of the dial and the movement direction of the AF target has been optimized.
• Battery check function has been improved to extend shooting time when the power grip HLD-4 is attached.
• Focusing now stops immediately when the AF start button (AEL/AFL or Fn button) is released.
• Improved performance with the FL-50R or FL-36R flash units when undertaking bounce flashes at short distances.
• The selection and prioritization of the central five ranging points when shooting in C-AF mode and dynamic-single target mode has been improved.

E-3 DSLR and E-510 DSLR bodies:

• Image stabilization is now available for OM mount non-Four Thirds System interchangeable lenses.

Zuiko 70mm-300mm Digital Specific™ Lens:

• Stabilized exposure precision

The firmware for all of these can be updated with the Olympus Master or Studio software.