For Premiere Pro, the keyboard shortcuts article is typically the most popular page in the Help system. However, when we launched CS6, there were some issues with search engines not finding specific pages that were previously easy to find. The page, Default keyboard shortcuts (CS5 & CS5.5), was unfortunately one of those pages. While we search for a fix, here is a link to the current set of keyboard shortcuts for Premiere Pro CS5 & Premiere Pro CS5.5:
For Adobe Premiere Pro CS6 keyboard shortcuts, see this blog post.