Gamerscore as of Jan 1: 20,030
First Achievement 2010:
Sam & Max Save the World: Easter Bunny - Found the Easter Egg.
20g (someone tell me how to make the logo)

1/09/10
And just for the hell of it.....
Begin 2009 GS: 8300
End 2009: 20,030
Fairly sure and Sam & Max was my last of '09
Other slightly OCD notes, I had to hit the even numbers for milestones:
10,000 GS mark - Man vs Tank. (Left 4 Dead)
20,000 GS mark - You're on a boat! (Borderlands)
EDIT: Looks like I finished Jan at 20,980. 950pt increase but behind my pace from last year.
EDIT2: Not keeping good track, but between 360 blog and True Achievements, I've placed the end of Feb score at 23360. That's a jump of 2380. Mass Effect 2 had the biggest portion.
Edit for 2011.
Finished the year with "An Honor Serving" for 25GS on 12/30/2010. Finishing 2010 with 32,190. An increase of 12,000. Right on pace with the previous year. I hit 30,000 evenly but without much fanfare of being a cool achievement. It was the "Half Deck" achievement in Dead Rising 2 for collecting half of the combo cards. I was into playing it and didn't want to stop and spend time thinking about what cool achievement to get.
Fittingly, I started 2011 then with my first achievement being "Phenotrans Nuisance" on 1/3/2011 for 10GS.