Swiss topo - Detailed maps of Switzerland, very good for hiking.
Visinand - A huge collection of hikes and natural curiosities in Vaud, Valais and surrounding areas, with many photos detailing nice views and technical/dangerous passages.
Sommet.ch - Another collection of hikes in the same surroundings, less photos but nice textual descriptions of the path.
Hikes for loners - A collection of hikes from the author of this book.
Randomandie
Vogelwarte - List of birds that can be seen in Switzerland. Good resource to identify the cool raptors flying around.
Hiking log