Slightly tangential, but related: on windows, Agent Ransack is an awesome program for searching through files/directories. It has a great UI, is quite fast, and

Slightly tangential, but related: on windows, Agent Ransack is an awesome program for searching through files/directories. It has a great UI, is quite fast, and has all the features you could want (regexes on filename and/or file contents, search history, etc). It is really helpful for doing quick lookups to see where methods/classes/variables are being used in the codebase.