Quicksilver, Evernote, SelfControl, and Terminal. On the web app side of it, I turn to Google (Gmail, Docs, Calendar), and Remember the Milk.
[1] http://arstechnica.com/open-source/guides/2009/05/vim-made-e...
[2] http://cream.sourceforge.net/
[3] http://www.spiegel.de/international/zeitgeist/0,1518,659577,...