Questions on Mac OS X from a web developer who is new to Mac
The first sounds like Wireshark, which you can install from Fink, MacPorts, or Homebrew.

The second, you don't need to run the built-in Apache at all.  System Preferences > Internet &amp; Wireless > Sharing, uncheck "Web Sharing".

The only real font control in OSX is System Preferences > Personal > Appearance, where you can control whether font smoothing is done at all and at what size OSX stops trying to smooth small fonts.  Some people don't handle smoothing well, so turning it off can be useful.  (Smoothing is done by borrowing and halftoning neighboring pixels, so the fonts really are fuzzy.  Some people find it easier to read, some harder.)