Thanks for help! I really didn't knew Wikitravel before. I found a lot of things just from links on that site and I am like "wow".
Siberia is a very large area (about 5 million square miles, compared the 3 million square miles of the lower 48 states). Your question is very broad. The traditions etc. Depend upon the part of Siberia you are talking about.
In exact I mean Yakutia and surroundings of Yakutia. I've read an article about it, but there were only geographical facts. I do not know how to find informations, so just asked a question on a few totally random sites.