I replaced the springs in my TCH with springs from a CamrySE. The suspension feels just a bit tighter, but not anything that I would really notice unless I was specifically trying to feel it. I believe the SE has a compeltely different strut than the Hybrid and other Camry's, so just changing the spring didn't make a huge difference. Also, the rear dropped 1/2" with the SE springs, but the front raised 1/2", which gives the car a weird look. So I've ordered a set of TRD springs and will probably only install the fronts (leaving the SE springs in the rear) to see how that drives.
See this thread for more info (including some back & forth between kris and I!

)
http://www.greenhybrid.com/discuss/s...ht=dropped+TCH