The Nordic Larp Rulebook
At Solmukohta 2012, Lizzie Stark gave an excellent rant that for Nordic Larp to be accessible, the players should write a damn rulebook. This page is to be a draft of what that rulebook should look like.
American Larps often have rulebooks, such as the NERO LARP Rulebook (9th edition) or The Book of LARP. The Nordic Larp book, edited by Jaakko Stenros and Markus Montola, is a good first step - but the ideal espoused is a short field guide for someone from another larp tradition to come into a Nordic Larp and understand what to expect and what to do.
A vital part of Nordic Larp is the attitude which you come into it with.
If you have a character in advance, you should costume for this character. Unless otherwise specified, you do not need period materials, but the costume should look convincing.
Once play has begun, any off-character talk it to be avoided as much as possible.
There are often no mechanics for resolving things like fights or other conflicts. Instead, the outcome is decided by social rules. (These should be elaborated here.)