Behance.net lets you build a dynamic, multimedia portfolio. It’s a sort of facebook for designers which allows you to connect and collaborate with other with others. It also offers job opportunities and insights for professional creatives. I’ve just been browsing through various profiles and they are amazing. You have to get approved in order to sign up. This helps to provide the highest quality of work. They also offer the possibility to become a watcher which probably allows you to comment and stuff like that. Go see for yourself. It’s definitely a great site for inspiration and to discover new artists!