Amsterdam : Getting There
Amsterdam is easily accessable by rail, bus, boat, car and air depending on which country you are traveling from. Travel is relatively cheap and frequent.
For train travel, visit the website of the Dutch Railways: www.ns.nl Cheap flights are available to and from Amsterdam. In the UK, I recommend Cheap Flights Online, especially for some good lastminute deals.
If you want to travel by bus which is very cheap, check out Eurolines