One thing I usually search for is cheap airport transfers to the cities I travel to, so I thought I'd share my experiences from Stockholm to those that may wanna know!
I travel quite a bit from Arlanda Airport, and I've tried two relatively new services to/from Arlanda Airport.
Airportshuttle (www.airportshuttle.se) is a new bus shuttle service that you can order from/to ANY hotel in Stockholm City. Only 150 SEK each way, and this beats all other services I've tried when travelling alone... They seem to be struggling with reservations, cause I was alone on my trip to the airport, but it was great! Private transfer for 150 SEK in a brand new car with great aircondition beats anything! They've got a cool Google Map link on their site to find closest stop if you happen to live in Stockholm!
But if you're two people travelling I would recommend AirportCab (www.airportcab.se) which is the cheapest alternative to/from the airport with a cab for only 350 SEK! That's around 100 SEK cheaper than all the other cab companies, and really good if you're more than 1 person travelling!
Anyway - those are my tips!