It might sound very strange, but all consumer activists recommend setting HIGH deductables and then only using the insurance for a loss that would otherwise destroy you financially.
Examples - your entire home and all it's contents burns down, the car you are driving crashes and causes $250,000 dmages, etc.
If you make claims, you are perceived (rightly) as a higher risk, and will be charged more down the road. It's best to self insure whenever you can.
When you buy a policy, you pay a commision to the insurance broker, you pay the insurance company's annual expenses (running offices, employing all those people, paying for their cell phones!), AND give the companies a healthy profit. PLUS the premiums have to cover all the claims each year, including those from all the people "scamming the system" (see some previous posts...).
This is why ALL electronics stores, computer companies, etc, try to sell you entended warranties as well - they are making a TON of cash off them.
The key is to use as much "free" insurance as possible, then only add as little as you need, with the highest deductables possible.
For example, a Platinum Visa card gives an extra one year warranty (sort of like Applecare) for free. They also provide theft insurance for a few months, I believe. Others have mentioned existing homeowners/home renters policies. A computer worth a couple grand is nothing, as most of these are $50,000 or more.
Be aware that these policies may limit use if used for business - as a travelling professional photographer, I listed a few items on a home policy for a number of years, but the added cost and limited coverage was just not worth it. Now I just self insure (saving $1000 a year).
So if you can bring yourslef to drop $300 a year in a savings account, after 4-5 years you'll have a healthy surplus.