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You can refer to IRS Publication 463 for guidance and instructions:
http://www.irs.gov/publications/p463/index.html

You need a log to show/prove the mileage. You're right, it's a pain until you get in the habit of writing it down, but after about three weeks, you'll start doing it automatically. I used to keep a little book, but now I just record the mileage on the calendar in my phone after each trip, and then transfer/print it monthly for a record). Some people with GPS phones use the trip records that those provide. There are lots of easy ways to capture the data -- you'll just have to adopt one and use it until it's a routine.

b2, IT IS NEVER TOO LATE FOR 2007'S TAXES.
If you feel you drove that many miles, you should deduct that many miles
and improve your record keeping for 2008.
LUCKIEST

If you are bad at keeping your daily mileage but use your vechicle almost exclusively for business you should look into using MileagePal (www.mileagepal.com) to create you logs. All it requires is a time period and your total mileage and it will generate a daily log. Hopefully this helps.