There's a great article called "Saving Hundreds of Dollars on Insurance" That was written to help consumers in the UK and the US save money on all different types of insurance. The author lists by category the more popular and reliable free on line quoting services (websites) and also the most popular companies that provide quotes on line.
If I had to choose a insurance site for consumers, I would propbably have to choose InsuranceEasy.org because they provide multiple links to different companies and services.