2007 Yaris making a new/bizarre noise

[jc2244]

I have a manual transmission 2007 Toyota Yaris with about 115,000 miles put on it. I bought it new so I know what wear/tear has been put on it.

Over the past few months, a distinct noise has been occuring...and has become more noticeable lately. It sounds like a cyclic/rotating dry noise that is present while parked, in idle, any gear, and does not go away when clutch is in or after accelerating to any particular speed. It sounds like the rotating noise speeds up at higher RPMs but nothing too fast to where I can't decipher it. I'm thinking a fan or belt? I'm not too sure what components of an manual transmission car is still at work while in park/idling (other than fans, radiator, or belts).

I take pretty good care of my car, but considering the mileage I'm crossing my fingers that it's nothing major. I get regular oil changes every 3k-5k miles, tire rotations/balancing when I get my oil changed, manually put in new spark plugs about 50k miles ago (I plan on replacing again pretty soon), replaces serpantine belt about 18k miles ago, check fluids regularly, etc.. I did however get OEM radiator (fan and hoses too) and water pump back in January of 2011, could be defects (no temperature or maintanance lights have gone off though)?

Any tips or insight to help me diagnosis this problem before I start messing around under the hood?