[AtomicLabMonkey]

Cobb (and others that have already mentioned it) might be on the right track. Jack up the car and start checking the torque on every bolt & fastener under the front end... any subframe bolts, control arm bolts, swaybar endlinks, upper & lower strut mount bolts, steering rack/links, etc. etc. Even if you don't have a torque wrench at least hit them with a regular wrench to make sure they're not noticeablely loose and about to fall out.

If you aren't comfortable doing it yourself, see if one of the other guys in the area can come help you out. Since you don't really know what the grease-monkeys monkeyed with, everything underneath should be checked. If I were you I would do it soon too, since the problem is apparently getting worse.