I'm a big fan of websites like longform.org in English, which post longer-length articles (mostly non-fiction) from newspapers, magazines, etc. Can anyone recommend a similar resource in Russian? Thanks!
samlib.ru contains some amount of articles, but it is mostly a fiction site and is very poorly categorized.
Most long articles I read come from blogs in livejournal.
Many web-communities maintain specialized resourses, like habrahabr.ru for IT wannabes, rolemancer.ru for tabletop rpg gamers, linux.org.ru for it-trolls and lurkmore.ru for bitards.
You can take a look at http://primerussia.ru/ page. They publish interesting articles on literature, philosophy, art, society and the authors usually are experts in the fields they are writing about.
http://lib.ru/ has a wide range of books by classic and modern authors. Mainly fiction and no periodicals though.