Islands Development Company (IDC) operates flights to resorts at Desroches (click to and Alphonse (click to www.alphonse-resort.com)
Several liveaboard boat operators specialise in trips to the outer islands. These include:
Indian Ocean Explorer [ visit them at http://www.ioexplorer.com ]
Silhouette Cruises [ visit them at http://seychelles.net/cruises/index.htm ]