Hello there,
First of all, the design is very clean. The homepage as a very nice greeting box and a basic news feed of the current project.
I enjoy the UI throughout the website. Again, very clean. Although, the black gradient footer is unnecessary. If you want a gradient, I would make it much more subtle to avoid it from looking tacky.
I would also shrink the header. A smaller, more simple logo would be much more memorable. You can place the logged in user info horizontally beside the "ADD PROJECT" button.
I would also prefer the "skills" to be placed in a categorized list format rather then a tag cloud. Easier to find what you are looking for. Same goes for the "roles".
I would also like to be able to sort the "members". You could sort them by project, geographical location or even profession.
I enjoy the relationship capability similar to a Twitter follow.I registered for an account without any problems.
I would like some AJAX capabilities added to the forms. You can use it for validation. Keep the server side validation in case the user has Javascript off. You can also add some style to the form inputs. Maybe an inset effect. The "Submit" buttons could have a similar style to the "ADD PROJECT" button.
This is a great idea for developers to show what they can do. This is a great app for freelancers trying to build a reputation. Great app.
Good luck!
Karl