We 301 redirected most of the pages (including the front page), but we did not do a complete site redirect as we were storing some images on the original site that we wanted to keep there.
I agree, it’s not worth obsessing over and our traffic doesn’t appear to have dropped much (we’re a very seasonal company so it can be difficult to tell). It was just principle more than anything =)
I agree with Mittineague, your PR hasn’t dropped off. PR simply doesn’t update very often in the toolbar and if they detect a mass change, they can ‘grey bar’ it in the short term.
PR is eyewash, has your listing affected by domain redirecting? If not enjoy new domain .I am sure you also must have changed URL in Google Webmaster Tools under Change of address link.