I do, because last year's worked (I stopped smoking a week after New Year and haven't smoked since). And occasionally I need a set in stone kick in the arse to make me do stuff otherwise I keep vaguely putting them off.
So mine are:
Spend less time on the internet
Get a rower with my Christmas and birthday money, and use it
Get some training sorted out, in the hope of being back in work this time next year
that'll do.