>I've been checking out the dotNetNuke site. Is anybody using it? Is it a real Content Management System (CMS)? A few comments: it's seems sort of sluggish and some of the modules don't seem to work. Apart from that I like the idea.
>This could be easily done in AVFP as well. If anybody was interested in doing this, I'd contribute the following modules: shopping cart, discussion forum, survey, but, someone else would have to do the bulk of the work putting it together...

Yes we use it.
www.priviledge.net, www.prowebce.com, www.ccebdf.com, http://cecptest.priviledge.net/
DNN is multiportal application. But it has Content Management features - TextHTML Editor Module. Most of the modules work and are profided with code to customize according your needs. There a more than 100 custome modules done for it.
There are only need to create VFP Data Provider to be in the game.
There are at lease 2-3 versions of the all the modules mentioned by you

HTH