Ferry boat connections:
The most important ferry boat connections to Sardinia are Genua-PortoTorres, Genua-Olbia, Livorno-Olbia, Livorno-Golfo Aranci, Civitavecchia-Olbia und Civitavecchia-Livorno-Golfo Aranci. Additionally there are connections to Arbatax and Cagliari.
The following companies operate on the above mentioned connections:
Tirrenia di Navigazione s.p.a.
Moby Lines s.p.a.
sardinia ferries
Grandi Navi Veloci

Flight connections:
Here some cheap airlines with flights to the Sardish airports Olbia, Alghero and Cagliari:
RAYANAIR
Thomsonfly
Meridiana

Photo galleries of Sardinia:
One very beautiful, extensive and affectionately prepared photo gallery is presented by the Sardinian photographer Paolo Sanna with the title
Archivio Fotografico delle Immagini di Sardegna
A series of beautiful pictures presents also Peter Zinken in his Fotogalerie Sardinien 2005
And still another archive by Pierpaolo Scioni in the Fotocommunity.

Online portals:
L'Isola di Sardegna,  un uncommercial site, iunfortunately only in Italian language. Publishes information of coasts, history, tradition, culture and a lot of other things.

Various:
Website of Loceri