Weird noise from timing belt/water pump area

My Camry started to make some weird noise from timing belt/water pump area a few days ago. Timing belt and water pump were replaced in Feb/2011 with OEM parts.
I've also noticed that there is no noise when I cold start my car, it only starts after 10-15 min. idle as the engine warms up.
I can't describe the type of noise that my car makes, so I've just uploaded the video on the youtube, here is the link:

http://www.youtube.com/watch?v=4vb5sA0HlmM