Well let's see here, you have 3 quality 3rd party games out this month.
The House Of The Dead: Overkill
Tenchu: Shadow Assassins
All 3 got very positive reviews, and I personally bought Deadly Creatures out of those 3, and let me tell you it's a very good effort made by the developer Rainbow Studios, the gameplay and graphics are done very well.
Plus, there are more games coming in 2009 as mentioned before. Keep your eyes pealed.