really? i guess that's why when i got an alignment, the shaking went away!
Can you describe one part of the suspension that changes because of new rims?
Unless you're running some radically different setup that includes tires WAY out of spec, the suspension geometry doesn't change at all with new rims, which means the alignment didn't change.
If an alignment fixed your shaking, there was something wrong - as in something was loose. When I dropped my car 2.5" I went a week without an alignment - no shaking. The car was WAY out of specs and no shaking, just funky tire wear.
Poor alignments don't cause shaking, they cause odd handling and strange tire wear. If the car is pulling to one side, that's faulty alignment; if the tires are getting f**ked up, that's faulty alignment.
As for the thread starter: Did you check if the rims were straight before mounting them on the car? They may have a bend that is causing the shaking.
Also, did you get them balanced at the same place both times? If the answer is yes then take them somewhere else to get balanced.
Quick test, switch the fronts to the rear and see if it changes things. Also, were the tires used? What size are the tires?