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however, the site is also available at [group.org,...] which appears to only have PR4
(i'm using group.org here only to differentiate it from the usual widgets.com, in that this is a primarily noncommercial site.
we have about 500 backlinks on the www and about 15 on the www-less url.
apart from hooking something into the entire site to redirect group.org/* to www.group.org/*, what other things could we do in a situation like this?
I arranged for 301 redirects in similar circumstances and have seen improved PR and better SERPS as a result.
It seems to me that nothing is lost by so doing and you will save yourself 15 * however many calls/emails it takes to get people to update their links in.
It is worth contacting them anyhow but at least you won't feel the need to keep checking whether they have done so...