What encoding settings should use when viewing the archives? I use Firefox and get problems with lyrics in Russian and the lyrics of bands like Falkenbach, basically anything that isn't a standard latin character.

Cyrillic (Windows-1251) usually works fine for Russian characters, but sometimes they become screwed up when someone updates the page while using different encoding, so then it's impossible to read them at all.

Fact of the matter is that, at current, there's no single setting that will allow you to view every page on the site without difficulties. It's possible to see the whole site properly, but you'll have to occasionally switch settings in order to do so. Hopefully this can be remedied somewhat in a future version.