Is it clunking at all? If so, it's probably the control arm bushings. ~$130 each depending on where you go. PITA to install by yourself, you'd probably want to take it into the shop.
If done by the book, i've read the transaxle needs to be lifted off the subframe to clear some bolts.
Pull the wheels off and inspect these bushings. If your car has over 80k, they are probably gone anyway.
If you don't want to foot the bill for new arms, and know (or are) a crafty DIYer, then check out: http://www.contour.org/forums/ultimatebb.php?ubb=get_topic;f=46;t=000522
