Your point about language is one clear difficulty to a large mass blog on the dkos scale and style. However, a European blogosphere would not have to be organized on the same principles. It really might be a series of smaller regional/national blogs with interaction to a couple of metablogs. These few metablogs would likely be in English and/or French, German, and Spanish.
Can you say "subsidiarity"? :)
There are, of course, other possible models.
I added a few new blogs which I found to the list. One B-List (Florian Mueller's blog on software patents in Europe), the others small.
http://fsfe.org/en/fellows/ciaran/ciaran_s_free_software_notes
he's been a real hub at various points in the SW patents campaign. I think that campaign may come to prominence again in the next few months. Maybe it will be useful to see if he becomes a hub again.
