You said you had an alignment done??? Did they give you a printout of the caster/camber/postive and negative toe adjustments made. They should have. Check that to see if they changed anything. Then also, like "mikedinthecity" said, have them check your tie rods but have them check your bushings in your sway bar and arm bushings. Sounds like the balance is off in the suspension. Doesnt surprise me about the tires. Even tire wear depends on proper suspension geometry.