Hmmm, sounds like Misfile to me. Am I still the same gender and the correct age?
Anyway ...
1. Write down everything I could remember, particularly stuff which would be useful to know for work, things that I could do with getting done earlier, and stuff which I could lay bets on to make money out of. My memory isn't THAT hot.
2. I'd buy the first out of the two ebay bikes I went to look at (the included cargo box and hotgrips would have been much more useful than shinier chrome), have signed up immediately for the full-license course after passing my initial training (so much time wasted from not being able to go on motorways, dear god; also I would have had more free time later each week when i really needed it), book a different holiday, and earlier (it was... an experience, but not one i'd eagerly repeat), and make sure I got something booked in for 2010 a lot earlier. Plus I'd ride certain suppliers at work a lot harder to get us quotes and full details of what would be required before work could start. More to let them know I wasn't cocking around than actually needing it, seeing as I'd remember a fair bit.
3. Also I'd put lots of money into stock in Cadburys...
4. And take my backpack with me into work instead of leaving it on the seat of the car that one time I had to park on a dodgy road and had no space in the boot... and mine & two other cars got broken into. I would also take a moment to find some way of electrifying the frame with 1000V of AC and hiding a camcorder inside to capture the moment - and the hood's face, in case he still made good his escape with the swag from the other two.
5. Take more time to see family members who I now know to be on their way to either death or creeping dementia in the interim...
6. Buy winter tyres and snow socks ahead of the big freeze this year
7. TWO TERA disks, fool. TWO. Not one!
8. Commute via junction 7 instead of 6 on the morning of the 20th. Or maybe pull a sickie, park up nearby, then get a good vantage point to see if the girl who ran into me was actually going to and doing what she claimed she was... Saving both a couple years of insurance lunacy, and satisfying curiosity.
9. Read my copy of Girl With The Dragon Tattoo BEFORE letting my mother get hold of it. By the time I got it back, Hornet's Nest had been and gone in the cinema...
Too bad it's all a little too late to stop me buying the car I'm in now (jeez, two years already?)... but, hey ho, it's doing alright.