Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.
Google has finally decided to shut down Google Reader on the 1st July. A lot of ardent fans of Google's RSS reader are upset. Here's a list of the alternatives you can switch to. This is a work in progress. Please tell me which ones I'm missing on Twitter (@hrishio). I'll make this chart collaborative very soon!
Tiny Tiny RSS is an open source web-based news feed (RSS/Atom) reader and aggregator, designed to allow you to read news from any location, while feeling as close to a real desktop application as possible.