I just added some navigational links right under the logo to help new visitors quickly get the big picture of what this site offers. I also think it might help seasoned posters identify some features they didn't know about such as the "free t-shirt for simple task" opportunity.
I imagine the navigational links will change over time based on feedback from people. Some prime candidates for change are the links under the "Physics GRE Forum", "Prospective Physics Grads", and "Current Physics Grads" sections. Please let me know if you have any ideas for threads that are more desirable to feature than the ones I selected.