For God's sake, STOP trying to re-implement my browser's interface with Javascript! I don't want you to "put in the effort" to make my URL bar, back/forward buttons, and tabs work the way they naturally do in my browser; that's what my browser is FOR! Even when the developer does put in the effort, the results are usually _just_ different enough in various subtle ways from the browser's native behviour as to be annoying.
Just build a normal website and let my browser do what it was built to do. The APIs that allow SPAs are great and useful. The Pixlr online photo editor has a good reason to be a SPA, and that works great for it. Your forum/email interface/management API would work better as a normal website.
