Olympus has announced firmware updates for four of its Zuiko lenses:
Zuiko Digital ED 8mm F3.5 Fisheye
ED 18-180mm F3.5-6.3
ED 70-300mm F4.0-5.6
ED 90-250mm F2.8
The updates are supposed to improve performance in continuous auto focus shooting mode using the top of the range E-3 and the E-30 digital SLRs.
firmware update page