Seriously, though - if the vibration you're describing is just the small rumble you get at idle, that tends to worsen while in D or R, and a bit more noticible with the A/C on, then it's something we've discussed here before, and it doesn't pose any issues long-term. My '05 LX has done it since new - and it's the same now at 29k miles as it was on day 1. After a while, you'll notice it less and less.
