A Bicycle Tour in Iceland (2009) - A nice site made by two australians who bicycled the Ring Road and the West Fjords. They've made a detailed description of the trip - day by day, with a lot of usefull information (i.e. a list and a map with most of the grocery stores in the outside the capital region).
Cycling in Iceland (- 2008) - A very informative site with a lot of information about practically everything you have to know about cycling in Iceland.
Cycling on Iceland (2008) - A pair of swedes who had a cycle journey in Iceland. They combined bicycle and bus, and went to the highlands, and the north and south of Iceland. Beautiful photos with amusing comments, and useful tips for the tour.
Around Iceland (2004) - South, east north and highlands. With detailed maps and route profile.