Another way to save on car insurance... GEICO offers discounts to about a hundred groups (alumni associations and such), but if you don't belong to any of the discount groups, you can buy a share of Berkshire Hathaway, B shares are about $127, and you can get the shareholders discount. Plus it's not a bad investment either.
I don't know what the savings are exactly since this I've always had the discount, but my friend told me yesterday he lowered his annual premium on two cars from $3,200 (not GEICO) to $1,800 (GEICO w/ shareholder discount).