Can someone give a sample or two of wordpress blog that have many users? so each user can post a content? Similar like soulcast but with wordpress. Or soulcast based on wordpress?
Here is one that I'm almost positive uses WP, but certainly has multiple authors: http://www.raincityguide.com/
I use wordpress on my site (www.wellwtf.com) and I have close to a dozen authors. If you want people to be able to sign up and be able to post content you simply need to add a link to the registration page and then in the control panel set what level you want new registered users to have (subscriber, author, etc...) - At that point, you are good to go. If you want you can even go the extra step and install a adsense rotating plug-in so each user can enter their adsense ID and then share in the display time for all posts that they write. Good luck to you!
Using gravatars for many authors as in http://www.raincityguide.com/ is works perfectly. All my will be author can upload their photos, now what are the right plugins so each user will have their own folder to store their photos. I'm thinking about galerry2. Thanks you all for all your great inputs.