There is a very well-established feedback loop on the TIGSource Forums, particularly in their Creative->Feedback sections. You can also document and display works in progress, update their completion status, and isolate individual components of your game for specialized feedback (Art, Music, Animation, Models, Code, etc).
Reddit Gamedev is another great resource for honest feedback. The community is large and diverse, so you can expect to get a number of alternative and possibly unexpected insights into how well your game is being received.
The forums over at IndieDB are another great place to communicate progress, chat with other developers of all levels of expertise and garner feedback.