Noise and the E-1
Check the dedicated Olympus E-1 interactive forum
Here are some image crops to illustrate noise characteristics of the E-1, exploring the ISO characteristcis of the E-1 from minmum ISO setting (100) to maximum (3200).
We also examine ISO 800 crops, one with in-camera noise filtering and one without (I'll leave you to decide whcih is which, for now!).

Above is the original scene, un-cropped. The conditions were overcast. All shots taken using pre-production E-1 firmware. Lens used, 14-54 zoom at widest zoom setting.
Here are approximately 225 pixel-wide crops, un-processed and saved in optimised JPEG format with Photoshop compression setting on 10 (minimum JPEG compressin is 12).
The samples start at ISO 100 at the top, going downwards in sequence: 100, 200, 400, 800, 1600 (ISO boost mode), 3200 (ISO boost mode).
Below are two larger 1:1 crops, at 800 ISO, saved again at Photoshop level 10 compression optimised JPEG format.
So which has the noise filter on and which doesn't (top/bottom)?. Tell us which you think on the E-1 p/review forum! (see discussion forum link below)
Check the dedicated Olympus E-1 interactive forum