Hmm, it looks like people seem to think its something wrong with my tires...dunno if this matters, but heres more info. I have 18" rims with Pirelli tires. Tire rotation was done about 1 1/2 weeks ago, so tire pressure should be okay (the symptoms where there before the tire rotation). I think the guy also pulled on the wheels after he put them on so to make sure the lugs were on tight.

Any other possible suggestions? =/