Something thing I find frustrating about del.icio.us (yes, I like the dots) is that you don't know who anybody is.
As a participating member of the Habari project I keep an eye on mentions of Habari all over the place. One of those places is Twitter, via a Tweet Scan feed for Habari, so that I get an item in my feed reader when someone tweets about Habari. When I have the chance, I visit the user's Twitter page, have a look at what they said, maybe visit their blog, and generally reply to them. This might be to address a specific issue or question they have, or just to point them to where they can talk to other users and developers.
I do the same thing on del.icio.us, where I have a subscription to bookmarks that are tagged 'habari'. This means that when someone comes across the Habari project web site or a useful plugin and saves it to del.icio.us (and they tag it sensibly), I get an item in my feed reader. So I go and have a look at the user's page and what do I see? I see their other bookmarks. That's it. I can't see their blog, I can't send them a message, it's a dead end. I can take pot luck and do a search to see if they use the same username elsewhere, but that's a bit ridiculous.
Please del.icio.us, let the conversations continue, or in the end you won't be a nice place to visit any more, and people will look elsewhere.