Welcome to P2. If you’re logged in, you’ll see a quick post box on the front page. The one hang up is that everything from the front page gets posted in the “asides” category. If you’re writing something longer, login and use the regular post editor, and assign categories. Ditto for anything with video or audio.
I think the new comments setup is awesome. They’re all listed in-page, so replies and such are much easier. Let me know what you think!