It is honestly why I bought the E-1. It was weathersealed and has the dust buster deal. I can still do an F22 sky shot with no dust on my sensor after 10k shots and changing lenses in the barn. There are things that other systems do better(like canon and high ISO) but, nothing that was more important to me. Plus I rarely have to mess with color.
I wish I was plush enough with cash to have multiple camera bodies. I am saving up for the replacement for the E-1. From the insider info I have gotten, it will be announced Jan 26 and shown at PMA. It is rumored to have double digit mp, excellent high ISO performance, more focus points, much faster AF and more fps. The biggie is that it may possibly have in body image stabilization.
My tax return is already slotted to paint the house and do some necessary things. Maybe by the end of the year....