If you haven’t been informed from your updater application yet, Adobe has made available a new version of Adobe Reader (8.1.1). Personally, being on a Mac, I prefer Preview because it seems a ton faster, but Adobe Reader is great for viewing, saving copies, and even adding security (passwords) to PDF documents. [Lots of] Designers use PDF documents regularly, and Reader is a good way to view these documents, (before delivering them to press for example), without having to run the bulkier Acrobat. (it launches noticeably faster than Acrobat too, from my experience).