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First of all, I'm sorry, my English is too bad.
A good friend that have a Oly E300 made some patches to gqview. Now, as I tested, can visualize E300, E400 and E500 .ORF raw files. It does not work well with E1 raw files.
The patch is at http://www.mediamax.com/redy/gqview-oly.patch
Apply it over gqview 2.1.1 or 2.1.2
patch -p1 </where/is/the/patch/gqview-oly.patch
The patch is not mine, but I have permisiion to use and distribute It. Thanks to Jose Blanco.
To John Ellis: Feel free to use it, as is, or modified as you want, in new releases.
Gqview is an excelent viewer!