I've always liked the concept behind the discussions in Windchill, unfortunately, Iv'e never seen it adopted because it can not fully replace e-mail, so users simple do not add another communication tool. I just got pointed to a startup that has a quick demo on what appears to be really good functionality/integration around Outlook with tasks and perhaps discussions. Check it out; http://www.vuuch.com/VuuchDemos the Outlook integration demo is less than 2 m inutes, but such a similar capability in 10.0 would not only enhance/replace discussions, but also go a long way toward justifying ProjectLink.
What does everyone think?