Robert_Charlton - 9:55 pm on Jul 21, 2010 (gmt 0)
I've always been in favor of unique articles tailored for sites that are willing to publish them.
Dupe copies of an article are unlikely to show up in the serps. I think they're also unlikely to pass link juice, though I haven't specifically tested this. A precise test would be difficult... but theory and observation suggests that links from duplicate content, as well as from duplicate context, are likely to be devalued.
In my experience, articles submitted as press releases, with anchor text and proper promotion, can produce excellent results if the sites that use your press releases rewrite them.
Re getting press release information published and featured in relevant publications, there's no substitute for personal contacts in whatever market/subject area you're in. This has long been true in the "real" world. That truth also hit the web a while back.
If you do have personal contacts, suggest that either they or you rewrite the articles so they'll be seen as unique.