Time to zoom over to Photography blog where they have a review of the Olympus 40-150mm M43rds superzoom lens. The Olympus lenses do not have optical stabilization because the Olympus bodies have sensor-shift stabilization.
SLR Gear has just published their review of the Micro Four Thirds edition of the Olympus 40-150mm f4-5.6 zoom lens. The E-P1 was used as the "base" camera. As usual we won't spill the beans here, so be sure to check it out if curious.