It was back in May that I first posted the screen cast for the Silverlight SharePoint Forums so you can tell we've been working on this idea for some time (since around January).
We decided to take a step back from Silverlight for the time being as we had no idea when the Silverlight 2.0 bits would be released. Plus the extra requirements of a client side install and extra web.config edits - we thought we'd wait to see how the enterprise adopts to the Silverlight thing!
So we've gone the web part/html route. We are using asp.net 3.5 due to some of the improvements with the ListView control over DataGrids. This does require a few edits to the web.config but we have shipped a seperate feature with the forums that takes care of this for you (based off the great work published on CodePlex).
The Lightning Storm Forums are using SharePoint Lists for storage, this means it is all nicely integrated and will work fine with various authentication options within SharePoint. For more info, screenshots and screencasts check out the page on the Lightning Tools web site...
http://www.lightningtools.com/lightning-storm-forums-for-sharepoint/default.aspx
And of course there's a trial version you can download.
We're capturing feedback/ideas and comments on the forum on our Connect site:
http://connect.lightningtools.com/default.aspx
If you'd like to be involved in the development process send us an email at support@lightningtools.com with the username you have registered on www.lightningtools.com