The end of one year and the beginning of another is a good time to take a few minutes out of your day to reflect on where you've been and where you want to go. You can't change the past, but you can exercise control of your future. An annual 'personal inventory' check is not a bad thing if you believe in ideas like self-actualization and personal improvement.
I like to view these things through a couple of lenses - primarily through the spiritual or emotional growth we experience as life offers us new circumstances and how we interact with these circumstances - including new friendships and personal relationships. Secondary to me is the physical via the creation of new products or services that provide value to strangers, and the general acquisition of material goods like a shiny new bicycle or a gold coin or a prize in a contest.
Focusing too much on either will leave you out of balance - being a great spiritual guide is all well and good except for the living barefoot under a bridge somewhere part. The same truth holds for being a hedonistic jetsetter always flashing the bling-bling while being a soulless ratfink bastard. If you live under a bridge no one can hear your message. If you ride high in the sky you can't hear anyone else.
2010 was a good year for me (and I hope, my wife), and I hope to make 2011 even better.