Daniel Miessler discusses the benefit of using Quicksilver, one of the mandatory mac applications, for searching the web – instead of using your browser. So you are in any app and you want to search for something online? Use Quicksilver. I blog from Textmate, so if I need to search for something on google (or elsewhere) – Quicksilver does it for me.
Its a very simple process to use as described by Daniel on his blog entry.