1. Buy DS.
2. Finish games you already own.
3. Master all games you already own.
4. buy less games from certain genres when you have simillar unfinished titles - it's great when you can buy new games for cheap thanks to some good deals, but when you have 7 racing titles from which only 1 you mastered and another 2 finished you know you have to stop buying them:/
5. instead of buying another 50 games in 2010 buy 12-15 and finish them all.