It's easy - Just list the 5 games you're looking forward to the most in the coming year. Here's mine:
1. Super Mario Galaxy 2
2. Tales of Graces
3. Ace Attorney Investigations: Miles Edgeworth
4. Final Fantasy XIII
5. No More Heroes: Desperate Struggle
It should be noted that Metroid: Other M would've been on this list if we knew more about it. As it is now, we know pretty much nothing about the game, or how it will play, so that's why I'm hesitant to put it on the list. The only reason Zelda Wii isn't on my list (despite not knowing anything about it) is because it hasn't been confirmed for 2010. ... Yet.