I've went to kcchiefs.com for years for news, updates...and use to subscribe to their email newsletter. My dumb internet provider began blocking their newsletters as SPAM and they don't allow me to over-ride it. :(
I've not joined, but think it's nice the Chiefs finally updated the official website to include the fans more with interactive forums & blogs, etc.. They were somewhat behind the times, as most NFL official team websites have included fan forums for quite some time.