F1 - When you click Help, you now get to Help
In response to popular demand, when you press F1 or select Help > Adobe Premiere Pro Help in Premiere Pro, your browser opens to, guess what, the landing page of Adobe Premiere Pro Help (Using Adobe Premiere Pro CS4). At the CS4 release, the default behavior had been set to open your browser to the Premiere Pro Help And Support page which features community-created instructional materials. The default has now been re-set to bring you to the Help landing page: probably where you expected to go when you pressed F1 or selected Help > Adobe Premiere Pro Help.
Should you prefer to jump to the Help And Support page when you press F1, however, you can still change the default to that option by selecting Community Help towards the bottom of the Using Adobe Premiere Pro CS4 landing page.