Techbase has proven to be a great resource for the KDE community of developers, administrators and project coordinators. It didn't offer much of anything to users, however, and that was purposeful: Techbase was designed with a clear purpose in mind, and I believe that to be a significant reason why it has been as successful as it has been.
To fill the user gap, however, the Community Working Group (CWG) members have started work on a wiki driven site much like Techbase but designed specifically for user appropriate content. It is not meant to replace documentation, but rather to augment it and provide a working communications channel for the KDE community of users about KDE as it develops and progresses.
Anne Wilson and Juan Carlos Torres of the CWG have been working on getting content on the wiki, working towards a structure for the content, etc. It's a huge task, however, and now that they've started the work and have set a pace for their efforts it is time for other interested people to join up and help make this new resource the amazing place it needs to become. Two people can't do it on their own, but a few dozen surely can and I know for a fact we have way more than that number of interested, concerned users.
So without further ado, say hello to Userbase!
Remember it is in a very early state right now and not a finished product by any stretch of the imagination. You can help Userbase achieve greatness sooner by emailing the Community Working Group who is hosting the Userbase project efforts and start adding content to the wiki.
Update: I just found out that the log in system for Userbase is still under construction. Danimo and Pino informed me that they having implemented only OpenID based authentication for Userbase, but that it's not fully exposed yet. Assuming this goes well, Techbase will follow suit later. Good news on all fronts, really, but one more bit of "early days, not completely ready" to deal with on Userbase as authentication gets ironed out.