Also @ turtlelife: you are aware of the fact that as for Ryanair, most of the airports are way the fuck out of the city? Sometimes, it's not even funny anymore. For example, "Frankfurt"-Hahn is more than 2 hours outside of Frankfurt. The same goes for "Stockholm", "Barcelona"-Girona/Reus etc.
Long story short, I'd advise you to get a eurorail ticket as well. Less of a hassle, faster from city centre to city centre and financially it should amount to the same (in summer, even tickets for low-cost carriers skyrocket).
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This. Wasted endless hours at the "discount"-airlne airport of Stockholm, which was like a two hour drive away from Stockholm, since the connection, unless you are in the centre of Stockholm, from elsewhere in Sweden was terrible.