Issue: I don't want to use Safari as my default web browser (e.g., for downloading URL-linked attachments in emails). How can I change the default web browser?

Solution: Start Safari. Type Cmd-, (i.e., Cmd-{comma}) or select Safari → Preferences. In the Preferences window, select the General tab, then find and select the desired web browser under the Default Web Browser pull-down menu. This will change the default web browser for all applications.

Note that Google Chrome, at least, will allow you to set it as the default browser the first time you start it after installation, and this setting is propagated into the Safari Preferences.

OS Version Compatibility: Lion, Snow Leopard, Leopard, Tiger

Update Status: 25 February 2010 (added)