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Modify The Default Font
The system font for the iPhone is Helvetica. The font is over 50 years old and is one of the most widely used fonts ever. Its success is due to its easy readability. It's also very boring! Guarav Giri ported a bunch of fonts to iPhone format and theses are the ones I'll be using. This tutorial takes for granted that you've already jailbroken your iPhone with PwnageTool.

Screenshots: Home Screen · Settings · Contacts · Weather
Easy Process
Guarav has done it again! Just go into Cydia and install Font Swap. Now you can swap fonts with a few taps!
Manual Process
  1. Install OpenSSH and set up Cyberduck on your computer. Don't know how? Click Here.
  2. Navigate to /System/Library/Fonts/Cache/.
  3. Replace Helvetica.ttf and HelveticaBold.ttf with NeoSans, Myria Pro, or Calibri.