Here are some useful links if You're planing a trip to Åland.

Eckerö Linjen	www.eckeolinjen.se	Trafficates: Grisslehamn - Eckerö
Viking Line	www.vikingline.se	Trafficates: Stockholm - Mariehamn (Långnäs) - Turku / Stockholm - Mariehamn - Helsinki / Kapellskär - Mariehamn
TallinkSilja Line	www.silja.com	Trafficates: Stockholm - Mariehamn (Långnäs) - Turku / Stockholm - Mariehamn - Helsinki
Skärgårdstrafiken	www.alandstrafiken.ax	Trafficates: Åland archipelago.and to the main-Finland
Åland's Turist Information	www.visitland.com	Very useful Information about Åland.
Ålandsresor	www.alandsresor.fi	Cotages, hotels and travel packages