im of the mind if it isn't broken dont fix it the only driver i update on a regular basis is the graphics driver and that is purely from a gaming aspect other than that i leave alone unless i need to update to sort out a problem
On the otherhand if you need a driver then buteman's suggestion is good. Always read the contract as they upload your 'old' drivers so you can download the recommended drivers you might not have. A good deal but limited to two a day unless you try just before midnight and after. :) Study well their terms and conditions.