Someone else out there is doing some great video interviews on K2. Michael Gannotti. Check out these great videos on K2 and BlueThread too.
http://sharepoint.microsoft.com/blogs/mikeg/Lists/Posts/Post.aspx?ID=1147
http://sharepoint.microsoft.com/blogs/mikeg/Lists/Posts/Post.aspx?ID=1148
If you have not followed Michael's videos and or blog I highly recommend it. It is on my list of favorites.