Main form of transport: plane
Morocco, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Finland, Italy, Spain, Portugal, Ireland
Oslo, Dusseldorf, Strasbourg, Maastricht, Kaunas, Vilnius, Tampere, Leipzig, Lisbon, Porto, Dublin
quite cheap but watch out for the bloated forms
See also http://en.wikipedia.org/wiki/Ryanair_destinations
Good tools to find Ryanair connections are Drungli, Azuon and AZair.com.