My other sound, suspension?

[N9QGS]

Okay I am only going to try to tackle two sounds that are on list list to try to resolve, this sound I occasionally hear (ill hear it more than 3 times on a typical trip) seems like it does it when either car is shifting, or Im turning (like into the driveway) or sometimes an uneven road surface, but its repeatability is poor.

the sound can be heard at http://public.me.com/n9qgs go under Toyota Yaris, and listen to noise.mp3, what you are hearing is me stopping at a stop sign and just as the car comes to a stop, it makes a brief sound that is the same sound I heard sometimes its at a slightly different pitch, sometimes last twice as long. but it strongly sounds like its coming right through the foot area of the passenger seat, like from the wheel well area. its a crunching squeaky chirp but not high in pitch. I've had the suspension checked on more than one occasion everything checked out each time, can anyone shoot an idea of what is making the noise or how to check it or force it to reproduce if it is something that has some excessive wear, I honestly would like to replace it out. I have heard it from the driver side too, but not as much, and also thought I heard it from the rear once or twice, but cant swear to it.