Two Versions of Site in Google

www or not www...that is the question

[veedub]

I am currently working on a site that has recently been relaunched after it had been abandoned for a few years.
It has some old backlinks from dmoz and other sites that link to it without the "www.".

Since the relaunch I use it as "www.domain.com" because I want to stick with the standard. There also are some new links coming in "right".

Now all new pages have been added to Google's index without the www. Doing a site:www.domain.com only shows
the homepage. The server currently is set up with relative links to internal pages. So it delivers all pages both with www and without it.

Its hopeless to change all old links to the www-style especially with dmoz. What would be the best way to transfer all PR, LR and other dmoz benefits to www.domain.com?

If I do a 301 for domain.com to www.domain.com, will I lose any benefits from dmoz whatsoever? Will Google directory "know" that www.domain.com is the same and treat it accordingly?

Thanks for your input!