Hi Guys,
The
www.yourdomain.com/anypage and .../anypage is IMHO a quality signal not a duplicate content issue. I wouldn't do a 301 redirect, Google will pick it up in due course anyway and the 301 could royally screw your Yahoo! SERPs.
Similarly mixing yourdomain.com and
www.yourdomain.com is something that Google will pick up on also. My suggestion is that you correct (internal linking structure) in any cases where this happens.
pne