A little bit of all…
dcresource.com have released a high-ISO comparison between the Canon EOS Rebel T1i vs. Nikon D5000 vs. Olympus E-620 . It’s unlikely that there  an Olympus E-series camera will feature video soon but just for fun you can take a look at this video showing the Zacuto.
And lastly we wish all the best to nikonrumors.com which turns one year old today! Happy Birthday!