g1smd - 7:33 pm on May 8, 2006 (gmt 0)

Check these three searches for canonical problems:

site:domain.com
site:domain.com -inurl:www
site:www.domain.com

One of those searches should show zero results. If both www and non-www pages show up then you have a problem.

Get the 301 redirect in place as soon as possible. Just because you have not had a problem in the past, isn't a reason for problems to not start now.

I see some cleanup of results on 72.14.207.99 for some sites. Check that DC, and compare it to the others regularly.