The Tips - Mac Kung Fu - page 167

You might also want to increase the size of the title bar font. Use the following
Terminal command to increase the point size to 16:
DEFAULTS WRITE COM.APPLE.FINDER NSTITLEBARFONTSIZE 16;KILLALL FINDER
Reverting to Defaults
To remove your font choices within Finder and revert to the default Lucida
Grande font, open a Terminal window, and type the following four lines:
DEFAULTS DELETE COM.APPLE.FINDER NSSYSTEMFONT
DEFAULTS DELETE COM.APPLE.FINDER NSTITLEBARFONT
DEFAULTS DELETE COM.APPLE.FINDER NSTITLEBARFONTSIZE
KILLALL FINDER
Changing the Fonts for Other Apps
This tip can be used to change the fonts of other apps in a similar way,
although not always with a high rate of success. To give it a try with an app,
first quit the app in question, and then type the following into a Terminal
window, typing the app's name after the -APP component (type it exactly as it
appears in the Applications list of Finder); the following will set the American
Typewriter font to be used in the title bars of TextEdit windows:
DEFAULTS WRITE -APP TEXTEDIT NSTITLEBARFONT -STRING AMERICANTYPEWRITER
The following line will set the title bar font for the Notes app to the Stencil
font:
DEFAULTS WRITE -APP NOTES NSTITLEBARFONT -STRING STENCIL
To revert to the default system font, modify the following line, again typing
the app's name after the -APP component; the following reverts TextEdit:
DEFAULTS DELETE -APP TEXTEDIT NSTITLEBARFONT
Tip 145
Stress Test Your Mac's CPU
If your Mac has been experiencing random crashes, you might want to run
a CPU stress test. This will load the processor to 100 percent, and you'll
therefore be able to determine whether it's faulty or, more likely, whether the
cooling system is faulty.