There's preciously little said about Vikings in this thread, so I will try to educate you all a little bit.
Please, if you have any serious questions I will do my best to answer them.
The Viking Era
Generally it is said that the Viking era stretched from circa 800 A.D. to circa 1000 A.D.
Some historians are more specific and say that the Viking raid on the monastery Lindisfarne on Holy Island in 793 A.D. was the start and that the battle of Hastings 1066 A.D. were the Viking rule over England was broken can be considered the end.
Others still puts the end of the Viking era to about 1150 when the whole of Scandinavia was finally Christian (with a few exceptions)
Viking Society
The population of Scandinavia during the Viking era were scarce, especially in Sweden and Norway. There were no cities and only a few larger villages and those were mainly trading posts. Most people made their living as farmers and fishermen, but hunting were also important in the north. Farms could grow quite big as several generations lived together for mutual protection quite close to each other.
Several farms and trading posts sometimes united under one leader called a Gode (can't translate it but is pronounced "good-eh"), a modern translation is approximatively 'chief'. The Gode were usually the richest/most successful farmer or trader in the area. The area over which a Gode ruled was known as "Godeord" or "Chief's Word", basically meaning that he only ruled as his word was good i.e. people listened to him.
As the population grew the idea of uniting larger areas under one ruler arose, these were called Jarl or Drottnar, nowadays "King", depending on were in Scandinavia they lived and also when during the Viking Era they ruled. These kings weren't sitting safely in their thrones and there were always several of them competing over who controlled what part of the lands. For example Sweden were divided into at least three sometimes four kingdoms, Denmark usually two while Norway only one. But they only controlled a very small area, outside of their area of control people were free.
The Vikings
Historians aren't in agreement about the roots of the word Viking. Some say that it comes from the word "Vik" which means bay, and is connected to the bay where Sweden and Norway connects, which was called "Viken" and from were most Vikings came. Others say that it comes from the fact that as pirates they often lay in ambush hidden in small bays. Fact is that only those Scandinavians sailing west, Danes and Norsemen, were called Vikings, the Swedes who sailed east were called Rus.
It was the ships that were the foundation of the Vikings' success. Quite small, nimble, fast and with a shallow draught (depth in water), while still being able to carry a lot of goods, they allowed the Vikings to either sail far inland on rivers to trade or to raid coastal areas and disappear before any defence could be put up. While piracy and raiding did bring income and loot, they were mainly traders, which is a lot safer.
There are several theories of why the Scandinavians started with the piracy and Viking raids. Both overpopulation and starvation have been put forward, but none are in my opinion valid. Most probably it was a good way for a young man to become rich and famous, which helped in finding a good wife and start a family.
Religion
The Norse pantheon was quite large and besides the main deities there are several that are hardly mentioned at all. Probably because they belong to an older belief. Worship of the gods consisted of sacrifices, quite often blood sacrifice "blot" (pronounced 'bloot'). Common practise was to sacrifice a pig or a horse, gather up the blood and smear it on an idol of one of the goods, which god depended on what the sacrifice was for. In larger temples or at law meetings, "ting", these sacrifices were conducted by a priest know as "blotgode" or a king if he was present. Rumours claim that every ninth year there were held a huge sacrifice in Uppsala which included human sacrifices, but there's only on source and he's a Christian - Archbishop Adam of Bremen, thus being doubtable.
But even if the common man did believe in the gods, he didn't worship daily but perhaps only at the sacrifices which occurred a few times a year only. The pragmatic people of the era knew that prayers won't make the crops grow, hard work will.
That was a lot of text, phew, even if I have omitted quite a lot. Sorry for any spelling or grammatical errors, it's bloody hard to write about Swedish stuff in English, the language gets all mucked about. This was written out of memory, and is quite generalised so some minor details may differ from textbooks and such.
I'll try to return with more about the Norse Mythology if you want me to, and once again I will try to answer serious questions about the Viking Era, Vikings, Runes, Norse Mythology and even the meaning of names to the best of my ability.