37Signals are trend setters when it comes to UI design. Pretty much every iteration of their Design/UI is followed by many web-apps. Remember the very first version of Ta-da list home page, then the old Basecamp homepage, and now the new Basecamp homepage. Also the layout of all their web apps is followed by many SaaS apps now. Now this - simple landing page, will be followed by many people now. It's good stuff!